diff --git a/BUILD.gn b/BUILD.gn
index 09e0f6a15..ee55846fe 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -375,6 +375,8 @@ static_library("libcef_static") {
     "libcef/browser/download_manager_delegate.h",
     "libcef/browser/extension_impl.cc",
     "libcef/browser/extension_impl.h",
+    "libcef/browser/extensions/api/storage/sync_value_store_cache.cc",
+    "libcef/browser/extensions/api/storage/sync_value_store_cache.h",
     "libcef/browser/extensions/api/tabs/tabs_api.cc",
     "libcef/browser/extensions/api/tabs/tabs_api.h",
     "libcef/browser/extensions/browser_context_keyed_service_factories.cc",
@@ -411,6 +413,10 @@ static_library("libcef_static") {
     "libcef/browser/extensions/pdf_extension_util.h",
     "libcef/browser/extensions/pdf_web_contents_helper_client.cc",
     "libcef/browser/extensions/pdf_web_contents_helper_client.h",
+    "libcef/browser/extensions/value_store/cef_value_store.cc",
+    "libcef/browser/extensions/value_store/cef_value_store.h",
+    "libcef/browser/extensions/value_store/cef_value_store_factory.cc",
+    "libcef/browser/extensions/value_store/cef_value_store_factory.h",
     "libcef/browser/file_dialog_runner.h",
     "libcef/browser/file_dialog_manager.cc",
     "libcef/browser/file_dialog_manager.h",
diff --git a/cef_paths2.gypi b/cef_paths2.gypi
index 4f792576e..81824e1f5 100644
--- a/cef_paths2.gypi
+++ b/cef_paths2.gypi
@@ -431,6 +431,7 @@
       'tests/ceftests/draggable_regions_unittest.cc',
       'tests/ceftests/extensions/background_unittest.cc',
       'tests/ceftests/extensions/chrome_alarms_unittest.cc',
+      'tests/ceftests/extensions/chrome_storage_unittest.cc',
       'tests/ceftests/extensions/chrome_tabs_unittest.cc',
       'tests/ceftests/extensions/extension_test_handler.cc',
       'tests/ceftests/extensions/extension_test_handler.h',
diff --git a/libcef/browser/extensions/api/storage/sync_value_store_cache.cc b/libcef/browser/extensions/api/storage/sync_value_store_cache.cc
new file mode 100644
index 000000000..8a6ab7be9
--- /dev/null
+++ b/libcef/browser/extensions/api/storage/sync_value_store_cache.cc
@@ -0,0 +1,97 @@
+// Copyright 2017 The Chromium Embedded Framework Authors.
+// Portions copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "libcef/browser/extensions/api/storage/sync_value_store_cache.h"
+
+#include <stddef.h>
+
+#include <limits>
+
+#include "content/public/browser/browser_thread.h"
+#include "extensions/browser/api/storage/backend_task_runner.h"
+#include "extensions/browser/api/storage/weak_unlimited_settings_storage.h"
+#include "extensions/browser/value_store/value_store_factory.h"
+#include "extensions/common/api/storage.h"
+#include "extensions/common/extension.h"
+#include "extensions/common/permissions/permissions_data.h"
+
+using content::BrowserThread;
+
+namespace extensions {
+
+namespace cef {
+
+namespace {
+
+// Returns the quota limit for local storage, taken from the schema in
+// extensions/common/api/storage.json.
+SettingsStorageQuotaEnforcer::Limits GetLocalQuotaLimits() {
+  SettingsStorageQuotaEnforcer::Limits limits = {
+      static_cast<size_t>(api::storage::local::QUOTA_BYTES),
+      std::numeric_limits<size_t>::max(), std::numeric_limits<size_t>::max()};
+  return limits;
+}
+
+}  // namespace
+
+SyncValueStoreCache::SyncValueStoreCache(
+    const scoped_refptr<ValueStoreFactory>& factory)
+    : storage_factory_(factory), quota_(GetLocalQuotaLimits()) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+}
+
+SyncValueStoreCache::~SyncValueStoreCache() {
+  DCHECK(IsOnBackendSequence());
+}
+
+void SyncValueStoreCache::RunWithValueStoreForExtension(
+    const StorageCallback& callback,
+    scoped_refptr<const Extension> extension) {
+  DCHECK(IsOnBackendSequence());
+
+  ValueStore* storage = GetStorage(extension.get());
+
+  // A neat way to implement unlimited storage; if the extension has the
+  // unlimited storage permission, force through all calls to Set().
+  if (extension->permissions_data()->HasAPIPermission(
+          APIPermission::kUnlimitedStorage)) {
+    WeakUnlimitedSettingsStorage unlimited_storage(storage);
+    callback.Run(&unlimited_storage);
+  } else {
+    callback.Run(storage);
+  }
+}
+
+void SyncValueStoreCache::DeleteStorageSoon(const std::string& extension_id) {
+  DCHECK(IsOnBackendSequence());
+  storage_map_.erase(extension_id);
+  storage_factory_->DeleteSettings(settings_namespace::SYNC,
+                                   ValueStoreFactory::ModelType::APP,
+                                   extension_id);
+  storage_factory_->DeleteSettings(settings_namespace::SYNC,
+                                   ValueStoreFactory::ModelType::EXTENSION,
+                                   extension_id);
+}
+
+ValueStore* SyncValueStoreCache::GetStorage(const Extension* extension) {
+  StorageMap::iterator iter = storage_map_.find(extension->id());
+  if (iter != storage_map_.end())
+    return iter->second.get();
+
+  ValueStoreFactory::ModelType model_type =
+      extension->is_app() ? ValueStoreFactory::ModelType::APP
+                          : ValueStoreFactory::ModelType::EXTENSION;
+  std::unique_ptr<ValueStore> store = storage_factory_->CreateSettingsStore(
+      settings_namespace::SYNC, model_type, extension->id());
+  std::unique_ptr<SettingsStorageQuotaEnforcer> storage(
+      new SettingsStorageQuotaEnforcer(quota_, std::move(store)));
+  DCHECK(storage.get());
+
+  ValueStore* storage_ptr = storage.get();
+  storage_map_[extension->id()] = std::move(storage);
+  return storage_ptr;
+}
+}  // namespace cef
+}  // namespace extensions
diff --git a/libcef/browser/extensions/api/storage/sync_value_store_cache.h b/libcef/browser/extensions/api/storage/sync_value_store_cache.h
new file mode 100644
index 000000000..269fc7cd0
--- /dev/null
+++ b/libcef/browser/extensions/api/storage/sync_value_store_cache.h
@@ -0,0 +1,56 @@
+// Copyright 2017 The Chromium Embedded Framework Authors.
+// Portions copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CEF_LIBCEF_BROWSER_EXTENSIONS_API_STORAGE_SYNC_VALUE_STORE_CACHE_H_
+#define CEF_LIBCEF_BROWSER_EXTENSIONS_API_STORAGE_SYNC_VALUE_STORE_CACHE_H_
+
+#include <memory>
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "extensions/browser/api/storage/settings_storage_quota_enforcer.h"
+#include "extensions/browser/api/storage/value_store_cache.h"
+
+namespace extensions {
+
+class ValueStoreFactory;
+
+namespace cef {
+
+// Based on LocalValueStoreCache
+// ValueStoreCache for the SYNC namespace. It owns a backend for apps and
+// another for extensions. Each backend takes care of persistence.
+class SyncValueStoreCache : public ValueStoreCache {
+ public:
+  explicit SyncValueStoreCache(const scoped_refptr<ValueStoreFactory>& factory);
+  ~SyncValueStoreCache() override;
+
+  // ValueStoreCache implementation:
+  void RunWithValueStoreForExtension(
+      const StorageCallback& callback,
+      scoped_refptr<const Extension> extension) override;
+  void DeleteStorageSoon(const std::string& extension_id) override;
+
+ private:
+  using StorageMap = std::map<std::string, std::unique_ptr<ValueStore>>;
+
+  ValueStore* GetStorage(const Extension* extension);
+
+  // The Factory to use for creating new ValueStores.
+  const scoped_refptr<ValueStoreFactory> storage_factory_;
+
+  // Quota limits (see SettingsStorageQuotaEnforcer).
+  const SettingsStorageQuotaEnforcer::Limits quota_;
+
+  // The collection of ValueStores for local storage.
+  StorageMap storage_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(SyncValueStoreCache);
+};
+}  // namespace cef
+}  // namespace extensions
+
+#endif  // CEF_LIBCEF_BROWSER_EXTENSIONS_API_STORAGE_SYNC_VALUE_STORE_CACHE_H_
diff --git a/libcef/browser/extensions/browser_context_keyed_service_factories.cc b/libcef/browser/extensions/browser_context_keyed_service_factories.cc
index 3e91c3853..c5bd27c45 100644
--- a/libcef/browser/extensions/browser_context_keyed_service_factories.cc
+++ b/libcef/browser/extensions/browser_context_keyed_service_factories.cc
@@ -8,6 +8,7 @@
 #include "chrome/browser/extensions/api/streams_private/streams_private_api.h"
 #include "chrome/browser/ui/prefs/prefs_tab_helper.h"
 #include "extensions/browser/api/alarms/alarm_manager.h"
+#include "extensions/browser/api/storage/storage_frontend.h"
 #include "extensions/browser/renderer_startup_helper.h"
 
 namespace extensions {
@@ -18,6 +19,7 @@ void EnsureBrowserContextKeyedServiceFactoriesBuilt() {
   CookieSettingsFactory::GetInstance();
   PrefsTabHelper::GetServiceInstance();
   RendererStartupHelperFactory::GetInstance();
+  StorageFrontend::GetFactoryInstance();
   StreamsPrivateAPI::GetFactoryInstance();
 }
 
diff --git a/libcef/browser/extensions/chrome_api_registration.cc b/libcef/browser/extensions/chrome_api_registration.cc
index e5a8d60a1..bd202e0c3 100644
--- a/libcef/browser/extensions/chrome_api_registration.cc
+++ b/libcef/browser/extensions/chrome_api_registration.cc
@@ -13,6 +13,7 @@
 #include "chrome/browser/extensions/api/resources_private/resources_private_api.h"
 #include "chrome/browser/extensions/api/streams_private/streams_private_api.h"
 #include "extensions/browser/api/alarms/alarms_api.h"
+#include "extensions/browser/api/storage/storage_api.h"
 #include "extensions/browser/extension_function_registry.h"
 
 namespace extensions {
@@ -36,6 +37,12 @@ const char* const kSupportedAPIs[] = {
     EXTENSION_FUNCTION_NAME(AlarmsGetAllFunction),
     EXTENSION_FUNCTION_NAME(AlarmsClearFunction),
     EXTENSION_FUNCTION_NAME(AlarmsClearAllFunction),
+    "storage",
+    EXTENSION_FUNCTION_NAME(StorageStorageAreaGetFunction),
+    EXTENSION_FUNCTION_NAME(StorageStorageAreaSetFunction),
+    EXTENSION_FUNCTION_NAME(StorageStorageAreaRemoveFunction),
+    EXTENSION_FUNCTION_NAME(StorageStorageAreaClearFunction),
+    EXTENSION_FUNCTION_NAME(StorageStorageAreaGetBytesInUseFunction),
     "tabs",
     EXTENSION_FUNCTION_NAME(cefimpl::TabsGetFunction),
     EXTENSION_FUNCTION_NAME(cefimpl::TabsExecuteScriptFunction),
@@ -67,6 +74,11 @@ void ChromeFunctionRegistry::RegisterAll(ExtensionFunctionRegistry* registry) {
   registry->RegisterFunction<AlarmsGetAllFunction>();
   registry->RegisterFunction<AlarmsClearFunction>();
   registry->RegisterFunction<AlarmsClearAllFunction>();
+  registry->RegisterFunction<StorageStorageAreaGetFunction>();
+  registry->RegisterFunction<StorageStorageAreaSetFunction>();
+  registry->RegisterFunction<StorageStorageAreaRemoveFunction>();
+  registry->RegisterFunction<StorageStorageAreaClearFunction>();
+  registry->RegisterFunction<StorageStorageAreaGetBytesInUseFunction>();
   registry->RegisterFunction<cefimpl::TabsExecuteScriptFunction>();
   registry->RegisterFunction<cefimpl::TabsInsertCSSFunction>();
   registry->RegisterFunction<cefimpl::TabsGetFunction>();
diff --git a/libcef/browser/extensions/extension_system.cc b/libcef/browser/extensions/extension_system.cc
index bae75bc20..8e65279a0 100644
--- a/libcef/browser/extensions/extension_system.cc
+++ b/libcef/browser/extensions/extension_system.cc
@@ -9,6 +9,7 @@
 
 #include "libcef/browser/extension_impl.h"
 #include "libcef/browser/extensions/pdf_extension_util.h"
+#include "libcef/browser/extensions/value_store/cef_value_store_factory.h"
 #include "libcef/browser/thread_util.h"
 #include "libcef/common/extensions/extensions_util.h"
 
@@ -21,6 +22,7 @@
 #include "base/strings/utf_string_conversions.h"
 #include "base/task_scheduler/post_task.h"
 #include "base/threading/thread_restrictions.h"
+#include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_paths.h"
 #include "components/crx_file/id_util.h"
 #include "content/public/browser/browser_context.h"
@@ -40,7 +42,7 @@
 #include "extensions/browser/renderer_startup_helper.h"
 #include "extensions/browser/runtime_data.h"
 #include "extensions/browser/service_worker_manager.h"
-#include "extensions/browser/value_store/value_store_factory.h"
+#include "extensions/browser/state_store.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/file_util.h"
@@ -153,7 +155,9 @@ CefExtensionSystem::CefExtensionSystem(BrowserContext* browser_context)
       renderer_helper_(
           extensions::RendererStartupHelperFactory::GetForBrowserContext(
               browser_context)),
-      weak_ptr_factory_(this) {}
+      weak_ptr_factory_(this) {
+  InitPrefs();
+}
 
 CefExtensionSystem::~CefExtensionSystem() {}
 
@@ -384,15 +388,15 @@ SharedUserScriptMaster* CefExtensionSystem::shared_user_script_master() {
 }
 
 StateStore* CefExtensionSystem::state_store() {
-  return nullptr;
+  return state_store_.get();
 }
 
 StateStore* CefExtensionSystem::rules_store() {
-  return nullptr;
+  return rules_store_.get();
 }
 
 scoped_refptr<ValueStoreFactory> CefExtensionSystem::store_factory() {
-  return nullptr;
+  return store_factory_;
 }
 
 InfoMap* CefExtensionSystem::info_map() {
@@ -467,6 +471,21 @@ CefExtensionSystem::ComponentExtensionInfo::ComponentExtensionInfo(
   }
 }
 
+void CefExtensionSystem::InitPrefs() {
+  store_factory_ = new CefValueStoreFactory(browser_context_->GetPath());
+
+  Profile* profile = Profile::FromBrowserContext(browser_context_);
+
+  // Two state stores. The latter, which contains declarative rules, must be
+  // loaded immediately so that the rules are ready before we issue network
+  // requests.
+  state_store_.reset(new StateStore(
+      profile, store_factory_, ValueStoreFrontend::BackendType::STATE, true));
+
+  rules_store_.reset(new StateStore(
+      profile, store_factory_, ValueStoreFrontend::BackendType::RULES, false));
+}
+
 // Implementation based on ComponentLoader::CreateExtension.
 scoped_refptr<const Extension> CefExtensionSystem::CreateExtension(
     const ComponentExtensionInfo& info,
diff --git a/libcef/browser/extensions/extension_system.h b/libcef/browser/extensions/extension_system.h
index e2c6d4516..2f054c886 100644
--- a/libcef/browser/extensions/extension_system.h
+++ b/libcef/browser/extensions/extension_system.h
@@ -116,6 +116,8 @@ class CefExtensionSystem : public ExtensionSystem {
   bool initialized() const { return initialized_; }
 
  private:
+  virtual void InitPrefs();
+
   // Information about a registered component extension.
   struct ComponentExtensionInfo {
     ComponentExtensionInfo(const base::DictionaryValue* manifest,
@@ -169,6 +171,10 @@ class CefExtensionSystem : public ExtensionSystem {
   std::unique_ptr<QuotaService> quota_service_;
   std::unique_ptr<AppSorting> app_sorting_;
 
+  std::unique_ptr<StateStore> state_store_;
+  std::unique_ptr<StateStore> rules_store_;
+  scoped_refptr<ValueStoreFactory> store_factory_;
+
   // Signaled when the extension system has completed its startup tasks.
   OneShotEvent ready_;
 
diff --git a/libcef/browser/extensions/extensions_api_client.cc b/libcef/browser/extensions/extensions_api_client.cc
index cc8bd8b24..0f17020a6 100644
--- a/libcef/browser/extensions/extensions_api_client.cc
+++ b/libcef/browser/extensions/extensions_api_client.cc
@@ -7,6 +7,7 @@
 
 #include "include/internal/cef_types_wrappers.h"
 #include "libcef/browser/browser_context_impl.h"
+#include "libcef/browser/extensions/api/storage/sync_value_store_cache.h"
 #include "libcef/browser/extensions/extension_web_contents_observer.h"
 #include "libcef/browser/extensions/mime_handler_view_guest_delegate.h"
 #include "libcef/browser/extensions/pdf_web_contents_helper_client.h"
@@ -66,4 +67,17 @@ void CefExtensionsAPIClient::AttachWebContentsHelpers(
   zoom::ZoomController::CreateForWebContents(web_contents);
 }
 
+void CefExtensionsAPIClient::AddAdditionalValueStoreCaches(
+    content::BrowserContext* context,
+    const scoped_refptr<ValueStoreFactory>& factory,
+    const scoped_refptr<base::ObserverListThreadSafe<SettingsObserver>>&
+        observers,
+    std::map<settings_namespace::Namespace, ValueStoreCache*>* caches) {
+  // Add support for chrome.storage.sync.
+  // Because we don't support syncing with Google, we follow the behavior of
+  // chrome.storage.sync as if Chrome were permanently offline, by using a local
+  // store see: https://developer.chrome.com/apps/storage for more information
+  (*caches)[settings_namespace::SYNC] = new cef::SyncValueStoreCache(factory);
+}
+
 }  // namespace extensions
diff --git a/libcef/browser/extensions/extensions_api_client.h b/libcef/browser/extensions/extensions_api_client.h
index 5e83d963b..821f0b67b 100644
--- a/libcef/browser/extensions/extensions_api_client.h
+++ b/libcef/browser/extensions/extensions_api_client.h
@@ -24,6 +24,18 @@ class CefExtensionsAPIClient : public ExtensionsAPIClient {
       MimeHandlerViewGuest* guest) const override;
   void AttachWebContentsHelpers(
       content::WebContents* web_contents) const override;
+
+  // Storage API support.
+
+  // Add any additional value store caches (e.g. for chrome.storage.managed)
+  // to |caches|. By default adds nothing.
+  void AddAdditionalValueStoreCaches(
+      content::BrowserContext* context,
+      const scoped_refptr<ValueStoreFactory>& factory,
+      const scoped_refptr<base::ObserverListThreadSafe<SettingsObserver>>&
+          observers,
+      std::map<settings_namespace::Namespace, ValueStoreCache*>* caches)
+      override;
 };
 
 }  // namespace extensions
diff --git a/libcef/browser/extensions/value_store/cef_value_store.cc b/libcef/browser/extensions/value_store/cef_value_store.cc
new file mode 100644
index 000000000..0f4240762
--- /dev/null
+++ b/libcef/browser/extensions/value_store/cef_value_store.cc
@@ -0,0 +1,110 @@
+// Copyright 2017 The Chromium Embedded Framework Authors.
+// Portions copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "libcef/browser/extensions/value_store/cef_value_store.h"
+
+#include <utility>
+
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+
+CefValueStore::CefValueStore() : read_count_(0), write_count_(0) {}
+
+CefValueStore::~CefValueStore() {}
+
+size_t CefValueStore::GetBytesInUse(const std::string& key) {
+  // Let SettingsStorageQuotaEnforcer implement this.
+  NOTREACHED();
+  return 0;
+}
+
+size_t CefValueStore::GetBytesInUse(const std::vector<std::string>& keys) {
+  // Let SettingsStorageQuotaEnforcer implement this.
+  NOTREACHED();
+  return 0;
+}
+
+size_t CefValueStore::GetBytesInUse() {
+  // Let SettingsStorageQuotaEnforcer implement this.
+  NOTREACHED();
+  return 0;
+}
+
+ValueStore::ReadResult CefValueStore::Get(const std::string& key) {
+  return Get(std::vector<std::string>(1, key));
+}
+
+ValueStore::ReadResult CefValueStore::Get(
+    const std::vector<std::string>& keys) {
+  read_count_++;
+  base::DictionaryValue* settings = new base::DictionaryValue();
+  for (std::vector<std::string>::const_iterator it = keys.begin();
+       it != keys.end(); ++it) {
+    base::Value* value = NULL;
+    if (storage_.GetWithoutPathExpansion(*it, &value)) {
+      settings->SetWithoutPathExpansion(*it, value->CreateDeepCopy());
+    }
+  }
+  return MakeReadResult(base::WrapUnique(settings), status_);
+}
+
+ValueStore::ReadResult CefValueStore::Get() {
+  read_count_++;
+  return MakeReadResult(storage_.CreateDeepCopy(), status_);
+}
+
+ValueStore::WriteResult CefValueStore::Set(WriteOptions options,
+                                           const std::string& key,
+                                           const base::Value& value) {
+  base::DictionaryValue settings;
+  settings.SetWithoutPathExpansion(key, value.CreateDeepCopy());
+  return Set(options, settings);
+}
+
+ValueStore::WriteResult CefValueStore::Set(
+    WriteOptions options,
+    const base::DictionaryValue& settings) {
+  write_count_++;
+  std::unique_ptr<ValueStoreChangeList> changes(new ValueStoreChangeList());
+  for (base::DictionaryValue::Iterator it(settings); !it.IsAtEnd();
+       it.Advance()) {
+    base::Value* old_value = NULL;
+    if (!storage_.GetWithoutPathExpansion(it.key(), &old_value) ||
+        !old_value->Equals(&it.value())) {
+      changes->push_back(ValueStoreChange(
+          it.key(), old_value ? old_value->CreateDeepCopy() : nullptr,
+          it.value().CreateDeepCopy()));
+      storage_.SetWithoutPathExpansion(it.key(), it.value().CreateDeepCopy());
+    }
+  }
+  return MakeWriteResult(std::move(changes), status_);
+}
+
+ValueStore::WriteResult CefValueStore::Remove(const std::string& key) {
+  return Remove(std::vector<std::string>(1, key));
+}
+
+ValueStore::WriteResult CefValueStore::Remove(
+    const std::vector<std::string>& keys) {
+  write_count_++;
+  std::unique_ptr<ValueStoreChangeList> changes(new ValueStoreChangeList());
+  for (std::vector<std::string>::const_iterator it = keys.begin();
+       it != keys.end(); ++it) {
+    std::unique_ptr<base::Value> old_value;
+    if (storage_.RemoveWithoutPathExpansion(*it, &old_value)) {
+      changes->push_back(ValueStoreChange(*it, std::move(old_value), nullptr));
+    }
+  }
+  return MakeWriteResult(std::move(changes), status_);
+}
+
+ValueStore::WriteResult CefValueStore::Clear() {
+  std::vector<std::string> keys;
+  for (base::DictionaryValue::Iterator it(storage_); !it.IsAtEnd();
+       it.Advance()) {
+    keys.push_back(it.key());
+  }
+  return Remove(keys);
+}
diff --git a/libcef/browser/extensions/value_store/cef_value_store.h b/libcef/browser/extensions/value_store/cef_value_store.h
new file mode 100644
index 000000000..c9fc6332e
--- /dev/null
+++ b/libcef/browser/extensions/value_store/cef_value_store.h
@@ -0,0 +1,59 @@
+// Copyright 2017 The Chromium Embedded Framework Authors.
+// Portions copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CEF_LIBCEF_BROWSER_EXTENSIONS_VALUE_STORE_CEF_VALUE_STORE_H_
+#define CEF_LIBCEF_BROWSER_EXTENSIONS_VALUE_STORE_CEF_VALUE_STORE_H_
+
+#include <stddef.h>
+
+#include <string>
+#include <vector>
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "extensions/browser/value_store/value_store.h"
+
+// Implementation Based on TestingValueStore
+// ValueStore with an in-memory storage but the ability to
+// optionally fail all operations.
+class CefValueStore : public ValueStore {
+ public:
+  CefValueStore();
+  ~CefValueStore() override;
+
+  // Accessors for the number of reads/writes done by this value store. Each
+  // Get* operation (except for the BytesInUse ones) counts as one read, and
+  // each Set*/Remove/Clear operation counts as one write. This is useful in
+  // tests seeking to assert that some number of reads/writes to their
+  // underlying value store have (or have not) happened.
+  int read_count() const { return read_count_; }
+  int write_count() const { return write_count_; }
+
+  // ValueStore implementation.
+  size_t GetBytesInUse(const std::string& key) override;
+  size_t GetBytesInUse(const std::vector<std::string>& keys) override;
+  size_t GetBytesInUse() override;
+  ReadResult Get(const std::string& key) override;
+  ReadResult Get(const std::vector<std::string>& keys) override;
+  ReadResult Get() override;
+  WriteResult Set(WriteOptions options,
+                  const std::string& key,
+                  const base::Value& value) override;
+  WriteResult Set(WriteOptions options,
+                  const base::DictionaryValue& values) override;
+  WriteResult Remove(const std::string& key) override;
+  WriteResult Remove(const std::vector<std::string>& keys) override;
+  WriteResult Clear() override;
+
+ private:
+  base::DictionaryValue storage_;
+  int read_count_;
+  int write_count_;
+  ValueStore::Status status_;
+
+  DISALLOW_COPY_AND_ASSIGN(CefValueStore);
+};
+
+#endif  // CEF_LIBCEF_BROWSER_EXTENSIONS_VALUE_STORE_CEF_VALUE_STORE_H_
diff --git a/libcef/browser/extensions/value_store/cef_value_store_factory.cc b/libcef/browser/extensions/value_store/cef_value_store_factory.cc
new file mode 100644
index 000000000..cd52d615d
--- /dev/null
+++ b/libcef/browser/extensions/value_store/cef_value_store_factory.cc
@@ -0,0 +1,191 @@
+// Copyright 2017 The Chromium Embedded Framework Authors.
+// Portions copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "libcef/browser/extensions/value_store/cef_value_store_factory.h"
+
+#include "base/memory/ptr_util.h"
+#include "extensions/browser/value_store/leveldb_value_store.h"
+#include "libcef/browser/extensions/value_store/cef_value_store.h"
+
+namespace {
+
+const char kUMAClientName[] = "Cef";
+
+}  // namespace
+
+namespace extensions {
+
+using SettingsNamespace = settings_namespace::Namespace;
+
+CefValueStoreFactory::StorageHelper::StorageHelper() = default;
+
+CefValueStoreFactory::StorageHelper::~StorageHelper() = default;
+
+std::set<ExtensionId> CefValueStoreFactory::StorageHelper::GetKnownExtensionIDs(
+    ModelType model_type) const {
+  std::set<ExtensionId> ids;
+  switch (model_type) {
+    case ValueStoreFactory::ModelType::APP:
+      for (const auto& key : app_stores_)
+        ids.insert(key.first);
+      break;
+    case ValueStoreFactory::ModelType::EXTENSION:
+      for (const auto& key : extension_stores_)
+        ids.insert(key.first);
+      break;
+  }
+  return ids;
+}
+
+void CefValueStoreFactory::StorageHelper::Reset() {
+  app_stores_.clear();
+  extension_stores_.clear();
+}
+
+ValueStore* CefValueStoreFactory::StorageHelper::AddValueStore(
+    const ExtensionId& extension_id,
+    ValueStore* value_store,
+    ModelType model_type) {
+  if (model_type == ValueStoreFactory::ModelType::APP) {
+    DCHECK(app_stores_.find(extension_id) == app_stores_.end());
+    app_stores_[extension_id] = value_store;
+  } else {
+    DCHECK(extension_stores_.find(extension_id) == extension_stores_.end());
+    extension_stores_[extension_id] = value_store;
+  }
+  return value_store;
+}
+
+void CefValueStoreFactory::StorageHelper::DeleteSettings(
+    const ExtensionId& extension_id,
+    ModelType model_type) {
+  switch (model_type) {
+    case ValueStoreFactory::ModelType::APP:
+      app_stores_.erase(extension_id);
+      break;
+    case ValueStoreFactory::ModelType::EXTENSION:
+      extension_stores_.erase(extension_id);
+      break;
+  }
+}
+
+bool CefValueStoreFactory::StorageHelper::HasSettings(
+    const ExtensionId& extension_id,
+    ModelType model_type) const {
+  switch (model_type) {
+    case ValueStoreFactory::ModelType::APP:
+      return app_stores_.find(extension_id) != app_stores_.end();
+    case ValueStoreFactory::ModelType::EXTENSION:
+      return extension_stores_.find(extension_id) != extension_stores_.end();
+  }
+  NOTREACHED();
+  return false;
+}
+
+ValueStore* CefValueStoreFactory::StorageHelper::GetExisting(
+    const ExtensionId& extension_id) const {
+  auto it = app_stores_.find(extension_id);
+  if (it != app_stores_.end())
+    return it->second;
+  it = extension_stores_.find(extension_id);
+  if (it != extension_stores_.end())
+    return it->second;
+  return nullptr;
+}
+
+CefValueStoreFactory::CefValueStoreFactory() = default;
+
+CefValueStoreFactory::CefValueStoreFactory(const base::FilePath& db_path)
+    : db_path_(db_path) {}
+
+CefValueStoreFactory::~CefValueStoreFactory() {}
+
+std::unique_ptr<ValueStore> CefValueStoreFactory::CreateRulesStore() {
+  if (db_path_.empty())
+    last_created_store_ = new CefValueStore();
+  else
+    last_created_store_ = new LeveldbValueStore(kUMAClientName, db_path_);
+  return base::WrapUnique(last_created_store_);
+}
+
+std::unique_ptr<ValueStore> CefValueStoreFactory::CreateStateStore() {
+  return CreateRulesStore();
+}
+
+CefValueStoreFactory::StorageHelper& CefValueStoreFactory::GetStorageHelper(
+    SettingsNamespace settings_namespace) {
+  switch (settings_namespace) {
+    case settings_namespace::LOCAL:
+      return local_helper_;
+    case settings_namespace::SYNC:
+      return sync_helper_;
+    case settings_namespace::MANAGED:
+      return managed_helper_;
+    case settings_namespace::INVALID:
+      break;
+  }
+  NOTREACHED();
+  return local_helper_;
+}
+
+std::unique_ptr<ValueStore> CefValueStoreFactory::CreateSettingsStore(
+    SettingsNamespace settings_namespace,
+    ModelType model_type,
+    const ExtensionId& extension_id) {
+  std::unique_ptr<ValueStore> settings_store(CreateRulesStore());
+  // Note: This factory is purposely keeping the raw pointers to each ValueStore
+  //       created. Tests using CefValueStoreFactory must be careful to keep
+  //       those ValueStore's alive for the duration of their test.
+  GetStorageHelper(settings_namespace)
+      .AddValueStore(extension_id, settings_store.get(), model_type);
+  return settings_store;
+}
+
+ValueStore* CefValueStoreFactory::LastCreatedStore() const {
+  return last_created_store_;
+}
+
+void CefValueStoreFactory::DeleteSettings(SettingsNamespace settings_namespace,
+                                          ModelType model_type,
+                                          const ExtensionId& extension_id) {
+  GetStorageHelper(settings_namespace).DeleteSettings(extension_id, model_type);
+}
+
+bool CefValueStoreFactory::HasSettings(SettingsNamespace settings_namespace,
+                                       ModelType model_type,
+                                       const ExtensionId& extension_id) {
+  return GetStorageHelper(settings_namespace)
+      .HasSettings(extension_id, model_type);
+}
+
+std::set<ExtensionId> CefValueStoreFactory::GetKnownExtensionIDs(
+    SettingsNamespace settings_namespace,
+    ModelType model_type) const {
+  return const_cast<CefValueStoreFactory*>(this)
+      ->GetStorageHelper(settings_namespace)
+      .GetKnownExtensionIDs(model_type);
+}
+
+ValueStore* CefValueStoreFactory::GetExisting(
+    const ExtensionId& extension_id) const {
+  ValueStore* existing_store = local_helper_.GetExisting(extension_id);
+  if (existing_store)
+    return existing_store;
+  existing_store = sync_helper_.GetExisting(extension_id);
+  if (existing_store)
+    return existing_store;
+  existing_store = managed_helper_.GetExisting(extension_id);
+  DCHECK(existing_store != nullptr);
+  return existing_store;
+}
+
+void CefValueStoreFactory::Reset() {
+  last_created_store_ = nullptr;
+  local_helper_.Reset();
+  sync_helper_.Reset();
+  managed_helper_.Reset();
+}
+
+}  // namespace extensions
diff --git a/libcef/browser/extensions/value_store/cef_value_store_factory.h b/libcef/browser/extensions/value_store/cef_value_store_factory.h
new file mode 100644
index 000000000..073b5f713
--- /dev/null
+++ b/libcef/browser/extensions/value_store/cef_value_store_factory.h
@@ -0,0 +1,97 @@
+// Copyright 2017 The Chromium Embedded Framework Authors.
+// Portions copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CEF_LIBCEF_BROWSER_EXTENSIONS_VALUE_STORE_CEF_VALUE_STORE_FACTORY_H_
+#define CEF_LIBCEF_BROWSER_EXTENSIONS_VALUE_STORE_CEF_VALUE_STORE_FACTORY_H_
+
+#include <map>
+#include <memory>
+#include <set>
+
+#include "base/files/file_path.h"
+#include "extensions/browser/value_store/value_store_factory.h"
+#include "extensions/common/extension_id.h"
+
+class ValueStore;
+
+namespace extensions {
+
+// Will either open a database on disk (if path provided) returning a
+// |LeveldbValueStore|. Otherwise a new |CefValueStore| instance will be
+// returned.
+class CefValueStoreFactory : public ValueStoreFactory {
+ public:
+  CefValueStoreFactory();
+  explicit CefValueStoreFactory(const base::FilePath& db_path);
+
+  // ValueStoreFactory
+  std::unique_ptr<ValueStore> CreateRulesStore() override;
+  std::unique_ptr<ValueStore> CreateStateStore() override;
+  std::unique_ptr<ValueStore> CreateSettingsStore(
+      settings_namespace::Namespace settings_namespace,
+      ModelType model_type,
+      const ExtensionId& extension_id) override;
+  void DeleteSettings(settings_namespace::Namespace settings_namespace,
+                      ModelType model_type,
+                      const ExtensionId& extension_id) override;
+  bool HasSettings(settings_namespace::Namespace settings_namespace,
+                   ModelType model_type,
+                   const ExtensionId& extension_id) override;
+  std::set<ExtensionId> GetKnownExtensionIDs(
+      settings_namespace::Namespace settings_namespace,
+      ModelType model_type) const override;
+
+  // Return the last created |ValueStore|. Use with caution as this may return
+  // a dangling pointer since the creator now owns the ValueStore which can be
+  // deleted at any time.
+  ValueStore* LastCreatedStore() const;
+  // Return a previously created |ValueStore| for an extension.
+  ValueStore* GetExisting(const ExtensionId& extension_id) const;
+  // Reset this class (as if just created).
+  void Reset();
+
+ private:
+  // Manages a collection of |ValueStore|'s created for an app/extension.
+  // One of these exists for each setting type.
+  class StorageHelper {
+   public:
+    StorageHelper();
+    ~StorageHelper();
+    std::set<ExtensionId> GetKnownExtensionIDs(ModelType model_type) const;
+    ValueStore* AddValueStore(const ExtensionId& extension_id,
+                              ValueStore* value_store,
+                              ModelType model_type);
+    void DeleteSettings(const ExtensionId& extension_id, ModelType model_type);
+    bool HasSettings(const ExtensionId& extension_id,
+                     ModelType model_type) const;
+    void Reset();
+    ValueStore* GetExisting(const ExtensionId& extension_id) const;
+
+   private:
+    std::map<ExtensionId, ValueStore*> app_stores_;
+    std::map<ExtensionId, ValueStore*> extension_stores_;
+
+    DISALLOW_COPY_AND_ASSIGN(StorageHelper);
+  };
+
+  StorageHelper& GetStorageHelper(
+      settings_namespace::Namespace settings_namespace);
+
+  ~CefValueStoreFactory() override;
+  base::FilePath db_path_;
+  ValueStore* last_created_store_ = nullptr;
+
+  // None of these value stores are owned by this factory, so care must be
+  // taken when calling GetExisting.
+  StorageHelper local_helper_;
+  StorageHelper sync_helper_;
+  StorageHelper managed_helper_;
+
+  DISALLOW_COPY_AND_ASSIGN(CefValueStoreFactory);
+};
+
+}  // namespace extensions
+
+#endif  // CEF_LIBCEF_BROWSER_EXTENSIONS_VALUE_STORE_CEF_VALUE_STORE_FACTORY_H_
diff --git a/tests/ceftests/extensions/chrome_storage_unittest.cc b/tests/ceftests/extensions/chrome_storage_unittest.cc
new file mode 100644
index 000000000..68b5f4692
--- /dev/null
+++ b/tests/ceftests/extensions/chrome_storage_unittest.cc
@@ -0,0 +1,472 @@
+// Copyright (c) 2017 The Chromium Embedded Framework Authors. All rights
+// reserved. Use of this source code is governed by a BSD-style license that
+// can be found in the LICENSE file.
+
+#include "tests/ceftests/extensions/extension_test_handler.h"
+#include "tests/ceftests/test_util.h"
+#include "tests/shared/browser/extension_util.h"
+
+#define STORAGE_TEST_GROUP_ALL(name, test_class) \
+  EXTENSION_TEST_GROUP_ALL(ChromeStorage##name, test_class)
+#define STORAGE_TEST_GROUP_MINIMAL(name, test_class) \
+  EXTENSION_TEST_GROUP_MINIMAL(ChromeStorage##name, test_class)
+
+namespace {
+
+const char kExtensionPath[] = "storage-extension";
+const char kSuccessMessage[] = "success";
+
+// Base class for testing chrome.storage methods.
+// See https://developer.chrome.com/extensions/storage
+class StorageTestHandler : public ExtensionTestHandler {
+ public:
+  explicit StorageTestHandler(RequestContextType request_context_type)
+      : ExtensionTestHandler(request_context_type) {
+    // Only creating the extension browser.
+    set_create_main_browser(false);
+  }
+
+  // CefExtensionHandler methods:
+  void OnExtensionLoaded(CefRefPtr<CefExtension> extension) override {
+    EXPECT_TRUE(CefCurrentlyOn(TID_UI));
+    EXPECT_FALSE(got_loaded_);
+    got_loaded_.yes();
+
+    // Verify |extension| contents.
+    EXPECT_FALSE(extension->GetIdentifier().empty());
+    EXPECT_STREQ(("extensions/" + std::string(kExtensionPath)).c_str(),
+                 client::extension_util::GetInternalExtensionResourcePath(
+                     extension->GetPath())
+                     .c_str());
+    TestDictionaryEqual(CreateManifest(), extension->GetManifest());
+
+    EXPECT_FALSE(extension_);
+    extension_ = extension;
+
+    CreateBrowserForExtension();
+  }
+
+  void OnExtensionUnloaded(CefRefPtr<CefExtension> extension) override {
+    EXPECT_TRUE(CefCurrentlyOn(TID_UI));
+    EXPECT_TRUE(extension_);
+    EXPECT_TRUE(extension_->IsSame(extension));
+    EXPECT_FALSE(got_unloaded_);
+    got_unloaded_.yes();
+    extension_ = NULL;
+
+    // Execute asynchronously so call stacks have a chance to unwind.
+    // Will close the browser windows.
+    CefPostTask(TID_UI, base::Bind(&StorageTestHandler::DestroyTest, this));
+  }
+
+  // CefLoadHandler methods:
+  void OnLoadingStateChange(CefRefPtr<CefBrowser> browser,
+                            bool isLoading,
+                            bool canGoBack,
+                            bool canGoForward) override {
+    CefRefPtr<CefExtension> extension = browser->GetHost()->GetExtension();
+    EXPECT_TRUE(extension);
+    EXPECT_TRUE(extension_->IsSame(extension));
+
+    if (isLoading) {
+      EXPECT_FALSE(extension_browser_);
+      extension_browser_ = browser;
+    } else {
+      EXPECT_TRUE(browser->IsSame(extension_browser_));
+
+      const std::string& url = browser->GetMainFrame()->GetURL();
+      EXPECT_STREQ(extension_url_.c_str(), url.c_str());
+    }
+  }
+
+  // CefRequestHandler methods:
+  CefRefPtr<CefResourceHandler> GetResourceHandler(
+      CefRefPtr<CefBrowser> browser,
+      CefRefPtr<CefFrame> frame,
+      CefRefPtr<CefRequest> request) override {
+    EXPECT_TRUE(browser->IsSame(extension_browser_));
+
+    CefRefPtr<CefExtension> extension = browser->GetHost()->GetExtension();
+    EXPECT_TRUE(extension);
+    EXPECT_TRUE(extension_->IsSame(extension));
+
+    const std::string& url = request->GetURL();
+    EXPECT_STREQ(extension_url_.c_str(), url.c_str());
+
+    EXPECT_FALSE(got_url_request_);
+    got_url_request_.yes();
+
+    // Handle the resource request.
+    return RoutingTestHandler::GetResourceHandler(browser, frame, request);
+  }
+
+ protected:
+  void OnLoadExtensions() override {
+    LoadExtension(kExtensionPath, CreateManifest());
+  }
+
+  bool OnMessage(CefRefPtr<CefBrowser> browser,
+                 const std::string& message) override {
+    if (message == "extension_onload") {
+      // From body onLoad in the extension browser.
+      EXPECT_TRUE(browser->IsSame(extension_browser_));
+      EXPECT_FALSE(got_body_onload_);
+      got_body_onload_.yes();
+      TriggerStorageApiJSFunction();
+      return true;
+    }
+    EXPECT_TRUE(browser->IsSame(extension_browser_));
+    EXPECT_FALSE(got_success_message_);
+    got_success_message_.yes();
+    EXPECT_STREQ(kSuccessMessage, message.c_str());
+    TriggerDestroyTest();
+    return true;
+  }
+
+  void OnDestroyTest() override {
+    extension_browser_ = NULL;
+
+    EXPECT_TRUE(got_loaded_);
+    EXPECT_TRUE(got_url_request_);
+    EXPECT_TRUE(got_body_onload_);
+    EXPECT_TRUE(got_trigger_api_function_);
+    EXPECT_TRUE(got_success_message_);
+    EXPECT_TRUE(got_unloaded_);
+  }
+
+  // Create a manifest that grants access to the storage API.
+  virtual CefRefPtr<CefDictionaryValue> CreateManifest() const {
+    ApiPermissionsList api_permissions;
+    api_permissions.push_back("storage");
+    return CreateDefaultManifest(api_permissions);
+  }
+
+  // Add resources in the extension browser.
+  virtual void OnAddExtensionResources(const std::string& origin) {
+    extension_url_ = origin + "extension.html";
+    AddResource(extension_url_, GetExtensionHTML(), "text/html");
+  }
+
+  // Returns the chrome.storage.* JS that is executed in the extension browser
+  // when the triggerStorageApi() JS function is called.
+  virtual std::string GetStorageApiJS() const = 0;
+
+  // Returns the JS that will be loaded in the extension browser. This
+  // implements the triggerStorageApi() JS function called from
+  // TriggerStorageApiJSFunction().
+  virtual std::string GetExtensionJS() const {
+    return "function triggerStorageApi() {" + GetStorageApiJS() + "}";
+  }
+
+  // Returns the HTML that will be loaded in the extension browser.
+  virtual std::string GetExtensionHTML() const {
+    return "<html><head><script>" + GetExtensionJS() +
+           "</script></head><body onLoad=" + GetMessageJS("extension_onload") +
+           ">Extension</body></html>";
+  }
+
+  virtual void TriggerDestroyTest() {
+    // Execute asynchronously so call stacks have a chance to unwind.
+    CefPostTask(TID_UI, base::Bind(&StorageTestHandler::UnloadExtension, this,
+                                   extension_));
+  }
+
+  CefRefPtr<CefExtension> extension() const { return extension_; }
+  std::string extension_url() const { return extension_url_; }
+  CefRefPtr<CefBrowser> extension_browser() const { return extension_browser_; }
+
+  bool got_success_message() const { return got_success_message_; }
+
+ private:
+  void CreateBrowserForExtension() {
+    const std::string& identifier = extension_->GetIdentifier();
+    EXPECT_FALSE(identifier.empty());
+    const std::string& origin =
+        client::extension_util::GetExtensionOrigin(identifier);
+    EXPECT_FALSE(origin.empty());
+
+    // Add extension resources.
+    OnAddExtensionResources(origin);
+
+    // Create a browser to host the extension.
+    CreateBrowser(extension_url_, request_context());
+  }
+
+  void TriggerStorageApiJSFunction() {
+    EXPECT_FALSE(got_trigger_api_function_);
+    got_trigger_api_function_.yes();
+
+    extension_browser_->GetMainFrame()->ExecuteJavaScript(
+        "triggerStorageApi();", extension_url_, 0);
+  }
+
+  CefRefPtr<CefExtension> extension_;
+  std::string extension_url_;
+  CefRefPtr<CefBrowser> extension_browser_;
+
+  TrackCallback got_loaded_;
+  TrackCallback got_url_request_;
+  TrackCallback got_body_onload_;
+  TrackCallback got_trigger_api_function_;
+  TrackCallback got_success_message_;
+  TrackCallback got_unloaded_;
+};
+}  // namespace
+
+namespace {
+
+// Test for chrome.storage.local.set(object items, function callback)
+// and  for chrome.storage.local.get(string or array of string or object keys,
+//                                   function callback)
+class LocalStorageTestHandler : public StorageTestHandler {
+ public:
+  explicit LocalStorageTestHandler(RequestContextType request_context_type)
+      : StorageTestHandler(request_context_type) {}
+
+ protected:
+  std::string GetStorageApiJS() const override {
+    return "chrome.storage.local.set({\"local_key_1\": \"local_value_1\"}, function() {"
+           "chrome.storage.local.get(\"local_key_1\", function (items) {"
+           "if(items[\"local_key_1\"] == \"local_value_1\") {" +
+           GetMessageJS(kSuccessMessage) +
+           "}});"
+           "});";
+  }
+
+ private:
+  IMPLEMENT_REFCOUNTING(LocalStorageTestHandler);
+  DISALLOW_COPY_AND_ASSIGN(LocalStorageTestHandler);
+};
+}  // namespace
+
+STORAGE_TEST_GROUP_ALL(LocalStorage, LocalStorageTestHandler);
+
+namespace {
+
+// Test for chrome.storage.local.getBytesInUse(string or array of string keys,
+//                                             function callback)
+class LocalStorageGetBytesInUseTestHandler : public StorageTestHandler {
+ public:
+  explicit LocalStorageGetBytesInUseTestHandler(
+      RequestContextType request_context_type)
+      : StorageTestHandler(request_context_type) {}
+
+ protected:
+  std::string GetStorageApiJS() const override {
+    return "chrome.storage.local.set({\"local_key_2\": \"local_value_2\"}, function() {"
+           "chrome.storage.local.getBytesInUse(\"local_key_2\", function (bytesInUse) {"
+           "if (bytesInUse == 26) {" +
+           GetMessageJS(kSuccessMessage) +
+           "}});"
+           "});";
+  }
+
+ private:
+  IMPLEMENT_REFCOUNTING(LocalStorageGetBytesInUseTestHandler);
+  DISALLOW_COPY_AND_ASSIGN(LocalStorageGetBytesInUseTestHandler);
+};
+}  // namespace
+
+STORAGE_TEST_GROUP_MINIMAL(LocalStorageGetBytesInUse,
+                           LocalStorageGetBytesInUseTestHandler);
+
+namespace {
+
+// Test for chrome.storage.local.remove(string or array of string keys, function
+// callback)
+class LocalStorageRemoveTestHandler : public StorageTestHandler {
+ public:
+  explicit LocalStorageRemoveTestHandler(
+      RequestContextType request_context_type)
+      : StorageTestHandler(request_context_type) {}
+
+ protected:
+  std::string GetStorageApiJS() const override {
+    return "chrome.storage.local.set({\"local_key_3\": \"local_value_3\"}, function() {"
+           "chrome.storage.local.remove(\"local_key_3\", function () {"
+           "chrome.storage.local.get(\"local_key_3\", function(items) {"
+           "if (items[\"local_key_3\"] == undefined) {" +
+           GetMessageJS(kSuccessMessage) +
+           "}})})"
+           "});";
+  }
+
+ private:
+  IMPLEMENT_REFCOUNTING(LocalStorageRemoveTestHandler);
+  DISALLOW_COPY_AND_ASSIGN(LocalStorageRemoveTestHandler);
+};
+}  // namespace
+
+STORAGE_TEST_GROUP_MINIMAL(LocalStorageRemove, LocalStorageRemoveTestHandler);
+
+namespace {
+
+// Test for chrome.storage.local.clear(function callback)
+class LocalStorageClearTestHandler : public StorageTestHandler {
+ public:
+  explicit LocalStorageClearTestHandler(RequestContextType request_context_type)
+      : StorageTestHandler(request_context_type) {}
+
+ protected:
+  std::string GetStorageApiJS() const override {
+    return "var value1Cleared = false;"
+           "var value2Cleared = false;"
+           "function checkCleared() {"
+           "if (value1Cleared && value2Cleared) {"
+           + GetMessageJS(kSuccessMessage) +
+           "}}"
+           "chrome.storage.local.set({\"local_key_4\": \"local_value_4\","
+           "\"local_key_5\": \"local_value_5\"}, function() {"
+           "chrome.storage.local.clear(function () {"
+
+           "chrome.storage.local.get(\"local_key_4\", function(items) {"
+           "if (items[\"local_key_4\"] == undefined) {"
+           "value1Cleared = true;"
+           "checkCleared();"
+           "}});"
+
+           "chrome.storage.local.get(\"local_key_5\", function(items) {"
+           "if (items[\"local_key_5\"] == undefined) {"
+           "value2Cleared = true;"
+           "checkCleared();"
+           "}});"
+           "})});";
+  }
+
+ private:
+  IMPLEMENT_REFCOUNTING(LocalStorageClearTestHandler);
+  DISALLOW_COPY_AND_ASSIGN(LocalStorageClearTestHandler);
+};
+}  // namespace
+
+STORAGE_TEST_GROUP_MINIMAL(LocalStorageClear, LocalStorageClearTestHandler);
+
+namespace {
+
+// Test for chrome.storage.sync.set(object items, function callback)
+// and  for chrome.storage.sync.get(string or array of string or object keys,
+//                                   function callback)
+class SyncStorageTestHandler : public StorageTestHandler {
+ public:
+  explicit SyncStorageTestHandler(RequestContextType request_context_type)
+      : StorageTestHandler(request_context_type) {}
+
+ protected:
+  std::string GetStorageApiJS() const override {
+    return "chrome.storage.sync.set({\"sync_key_1\": \"sync_value_1\"}, function() {"
+           "chrome.storage.sync.get(\"sync_key_1\", function (items) {"
+           "if (items[\"sync_key_1\"] == \"sync_value_1\") {" +
+           GetMessageJS(kSuccessMessage) +
+           "}});"
+           "});";
+  }
+
+ private:
+  IMPLEMENT_REFCOUNTING(SyncStorageTestHandler);
+  DISALLOW_COPY_AND_ASSIGN(SyncStorageTestHandler);
+};
+}  // namespace
+
+STORAGE_TEST_GROUP_ALL(SyncStorage, SyncStorageTestHandler);
+
+namespace {
+
+// Test for chrome.storage.sync.getBytesInUse(string or array of string keys,
+//                                             function callback)
+class SyncStorageGetBytesInUseTestHandler : public StorageTestHandler {
+ public:
+  explicit SyncStorageGetBytesInUseTestHandler(
+      RequestContextType request_context_type)
+      : StorageTestHandler(request_context_type) {}
+
+ protected:
+  std::string GetStorageApiJS() const override {
+    return "chrome.storage.sync.set({\"sync_key_2\": \"sync_value_2\"}, function() {"
+           "chrome.storage.sync.getBytesInUse(\"sync_key_2\", function (bytesInUse) {"
+           "if (bytesInUse == 24) {" +
+           GetMessageJS(kSuccessMessage) +
+           "}});"
+           "});";
+  }
+
+ private:
+  IMPLEMENT_REFCOUNTING(SyncStorageGetBytesInUseTestHandler);
+  DISALLOW_COPY_AND_ASSIGN(SyncStorageGetBytesInUseTestHandler);
+};
+}  // namespace
+
+STORAGE_TEST_GROUP_MINIMAL(SyncStorageGetBytesInUse,
+                           SyncStorageGetBytesInUseTestHandler);
+
+namespace {
+
+// Test for chrome.storage.sync.remove(string or array of string keys, function
+// callback)
+class SyncStorageRemoveTestHandler : public StorageTestHandler {
+ public:
+  explicit SyncStorageRemoveTestHandler(RequestContextType request_context_type)
+      : StorageTestHandler(request_context_type) {}
+
+ protected:
+  std::string GetStorageApiJS() const override {
+    return "chrome.storage.sync.set({\"sync_key_3\": \"sync_value_3\"}, function() {"
+           "chrome.storage.sync.remove(\"sync_key_3\", function () {"
+           "chrome.storage.sync.get(\"sync_key_3\", function(items) {"
+           "if (items[\"sync_key_3\"] == undefined) {" +
+           GetMessageJS(kSuccessMessage) +
+           "}})})"
+           "});";
+  }
+
+ private:
+  IMPLEMENT_REFCOUNTING(SyncStorageRemoveTestHandler);
+  DISALLOW_COPY_AND_ASSIGN(SyncStorageRemoveTestHandler);
+};
+}  // namespace
+
+STORAGE_TEST_GROUP_MINIMAL(SyncStorageRemove, SyncStorageRemoveTestHandler);
+
+namespace {
+
+// Test for chrome.storage.sync.clear(function callback)
+class SyncStorageClearTestHandler : public StorageTestHandler {
+ public:
+  explicit SyncStorageClearTestHandler(RequestContextType request_context_type)
+      : StorageTestHandler(request_context_type) {}
+
+ protected:
+  std::string GetStorageApiJS() const override {
+    return "var value1Cleared = false;"
+           "var value2Cleared = false;"
+
+           "function checkCleared() {"
+           "if (value1Cleared && value2Cleared) {"
+           + GetMessageJS(kSuccessMessage) +
+           "}}"
+
+           "chrome.storage.sync.set({\"sync_key_4\": \"sync_value_4\","
+           "\"sync_key_5\": \"sync_value_5\"}, function() {"
+           "chrome.storage.sync.clear(function () {"
+
+           "chrome.storage.sync.get(\"sync_key_4\", function(items) {"
+           "if (items[\"sync_key_4\"] == undefined) {"
+           "value1Cleared = true;"
+           "checkCleared();"
+           "}});"
+
+           "chrome.storage.sync.get(\"sync_key_5\", function(items) {"
+           "if (items[\"sync_key_5\"] == undefined) {"
+           "value2Cleared = true;"
+           "checkCleared();"
+           "}});"
+
+           "})});";
+  }
+
+ private:
+  IMPLEMENT_REFCOUNTING(SyncStorageClearTestHandler);
+  DISALLOW_COPY_AND_ASSIGN(SyncStorageClearTestHandler);
+};
+}  // namespace
+
+STORAGE_TEST_GROUP_MINIMAL(SyncStorageClear, SyncStorageClearTestHandler);