Fix WebRTC support (issue #531).

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1131 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

cef.gyp

@@ -874,6 +874,8 @@
         'libcef/browser/javascript_dialog.h',
         'libcef/browser/javascript_dialog_manager.cc',
         'libcef/browser/javascript_dialog_manager.h',
+        'libcef/browser/media_capture_devices_dispatcher.cc',
+        'libcef/browser/media_capture_devices_dispatcher.h',
         'libcef/browser/menu_creator.cc',
         'libcef/browser/menu_creator.h',
         'libcef/browser/menu_model_impl.cc',

libcef/browser/browser_host_impl.cc

@@ -10,16 +10,19 @@
 
 #include "libcef/browser/browser_context.h"
 #include "libcef/browser/browser_info.h"
+#include "libcef/browser/browser_pref_store.h"
 #include "libcef/browser/chrome_scheme_handler.h"
 #include "libcef/browser/content_browser_client.h"
 #include "libcef/browser/context.h"
 #include "libcef/browser/devtools_delegate.h"
+#include "libcef/browser/media_capture_devices_dispatcher.h"
 #include "libcef/browser/navigate_params.h"
 #include "libcef/browser/scheme_registration.h"
 #include "libcef/browser/thread_util.h"
 #include "libcef/browser/url_request_context_getter.h"
 #include "libcef/browser/url_request_context_getter_proxy.h"
 #include "libcef/common/cef_messages.h"
+#include "libcef/common/cef_switches.h"
 #include "libcef/common/http_header_utils.h"
 #include "libcef/common/main_delegate.h"
 #include "libcef/common/process_message_impl.h"
@@ -27,6 +30,7 @@
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
+#include "base/command_line.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/download_manager.h"
@@ -1608,12 +1612,44 @@ void CefBrowserHostImpl::RequestMediaAccessPermission(
     const content::MediaResponseCallback& callback) {
   CEF_CURRENTLY_ON_UIT();
 
-  // TODO(cef): Get the default devices for the request. See for example
-  // chrome/browser/media/media_stream_devices_controller.cc.
   content::MediaStreamDevices devices;
 
-  // TODO(cef): Give the user an opportunity to approve the device list or run
+  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
-  // the callback with an empty device list to cancel the request.
+  if (!command_line.HasSwitch(switches::kEnableMediaStream)) {
+    // Cancel the request.
+    callback.Run(devices);
+    return;
+  }
+
+  // Based on chrome/browser/media/media_stream_devices_controller.cc
+  bool microphone_requested =
+      (request.audio_type == content::MEDIA_DEVICE_AUDIO_CAPTURE);
+  bool webcam_requested = 
+      (request.video_type == content::MEDIA_DEVICE_VIDEO_CAPTURE);
+  if (microphone_requested || webcam_requested) {
+    switch (request.request_type) {
+      case content::MEDIA_OPEN_DEVICE:
+        // For open device request pick the desired device or fall back to the
+        // first available of the given type.
+        CefMediaCaptureDevicesDispatcher::GetInstance()->GetRequestedDevice(
+            request.requested_device_id,
+            microphone_requested,
+            webcam_requested,
+            &devices);
+        break;
+      case content::MEDIA_DEVICE_ACCESS:
+      case content::MEDIA_GENERATE_STREAM:
+      case content::MEDIA_ENUMERATE_DEVICES:
+        // Get the default devices for the request.
+        CefMediaCaptureDevicesDispatcher::GetInstance()->
+            GetDefaultDevices(_Context->pref_service(),
+                              microphone_requested,
+                              webcam_requested,
+                              &devices);
+        break;
+    }
+  }
+
   callback.Run(devices);
 }
 

libcef/browser/browser_main.cc

@@ -60,8 +60,9 @@ int CefBrowserMainParts::PreCreateThreads() {
   content::GpuDataManager::GetInstance();
 
   // Initialize user preferences.
-  user_prefs_ = new BrowserPrefStore();
+  pref_store_ = new CefBrowserPrefStore();
-  user_prefs_->SetInitializationCompleted();
+  pref_store_->SetInitializationCompleted();
+  pref_service_.reset(pref_store_->CreateService());
 
   // Create a v8::Isolate for the current thread if it doesn't already exist.
   if (!v8::Isolate::GetCurrent()) {
@@ -75,7 +76,7 @@ int CefBrowserMainParts::PreCreateThreads() {
   // Initialize proxy configuration tracker.
   pref_proxy_config_tracker_.reset(
       ProxyServiceFactory::CreatePrefProxyConfigTracker(
-          user_prefs_->CreateService()));
+          pref_service_.get()));
 
   return 0;
 }

libcef/browser/browser_main.h

@@ -10,6 +10,7 @@
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/prefs/pref_service.h"
 #include "base/string_piece.h"
 #include "chrome/browser/net/pref_proxy_config_tracker.h"
 #include "content/public/browser/browser_main_parts.h"
@@ -44,6 +45,7 @@ class CefBrowserMainParts : public content::BrowserMainParts {
 
   CefBrowserContext* browser_context() const { return browser_context_.get(); }
   CefDevToolsDelegate* devtools_delegate() const { return devtools_delegate_; }
+  PrefService* pref_service() const { return pref_service_.get(); }
   scoped_ptr<net::ProxyConfigService> proxy_config_service() {
     return proxy_config_service_.Pass();
   }
@@ -57,7 +59,8 @@ class CefBrowserMainParts : public content::BrowserMainParts {
   scoped_ptr<MessageLoop> message_loop_;
   scoped_ptr<PrefProxyConfigTracker> pref_proxy_config_tracker_;
   scoped_ptr<net::ProxyConfigService> proxy_config_service_;
-  scoped_refptr<BrowserPrefStore> user_prefs_;
+  scoped_refptr<CefBrowserPrefStore> pref_store_;
+  scoped_ptr<PrefService> pref_service_;
   v8::Isolate* proxy_v8_isolate_;
 
   DISALLOW_COPY_AND_ASSIGN(CefBrowserMainParts);

libcef/browser/browser_pref_store.cc

@@ -3,19 +3,21 @@
 // be found in the LICENSE file.
 
 #include "libcef/browser/browser_pref_store.h"
+#include "libcef/browser/media_capture_devices_dispatcher.h"
 
 #include "base/command_line.h"
 #include "base/prefs/pref_service_builder.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/values.h"
+#include "chrome/browser/net/pref_proxy_config_tracker_impl.h"
 #include "chrome/browser/prefs/command_line_pref_store.h"
 #include "chrome/browser/prefs/proxy_config_dictionary.h"
 #include "chrome/common/pref_names.h"
 
-BrowserPrefStore::BrowserPrefStore() {
+CefBrowserPrefStore::CefBrowserPrefStore() {
 }
 
-PrefService* BrowserPrefStore::CreateService() {
+PrefService* CefBrowserPrefStore::CreateService() {
   PrefServiceBuilder builder;
   builder.WithCommandLinePrefs(
       new CommandLinePrefStore(CommandLine::ForCurrentProcess()));
@@ -24,11 +26,11 @@ PrefService* BrowserPrefStore::CreateService() {
   scoped_refptr<PrefRegistrySimple> registry(new PrefRegistrySimple());
 
   // Default settings.
-  registry->RegisterDictionaryPref(prefs::kProxy,
+  CefMediaCaptureDevicesDispatcher::RegisterPrefs(registry);
-                                   ProxyConfigDictionary::CreateDirect());
+  PrefProxyConfigTrackerImpl::RegisterPrefs(registry);
 
   return builder.Create(registry);
 }
 
-BrowserPrefStore::~BrowserPrefStore() {
+CefBrowserPrefStore::~CefBrowserPrefStore() {
 }

libcef/browser/browser_pref_store.h

@@ -9,16 +9,16 @@
 
 class PrefService;
 
-class BrowserPrefStore : public TestingPrefStore {
+class CefBrowserPrefStore : public TestingPrefStore {
  public:
-  BrowserPrefStore();
+  CefBrowserPrefStore();
 
   PrefService* CreateService();
 
  protected:
-  virtual ~BrowserPrefStore();
+  virtual ~CefBrowserPrefStore();
 
-  DISALLOW_COPY_AND_ASSIGN(BrowserPrefStore);
+  DISALLOW_COPY_AND_ASSIGN(CefBrowserPrefStore);
 };
 
 #endif  // CEF_LIBCEF_BROWSER_BROWSER_PREF_STORE_H_

libcef/browser/content_browser_client.cc

@@ -14,6 +14,7 @@
 #include "libcef/browser/browser_settings.h"
 #include "libcef/browser/chrome_scheme_handler.h"
 #include "libcef/browser/context.h"
+#include "libcef/browser/media_capture_devices_dispatcher.h"
 #include "libcef/browser/resource_dispatcher_host_delegate.h"
 #include "libcef/browser/thread_util.h"
 #include "libcef/browser/web_plugin_impl.h"
@@ -27,7 +28,6 @@
 #include "content/browser/plugin_service_impl.h"
 #include "content/public/browser/access_token_store.h"
 #include "content/public/browser/browser_url_handler.h"
-#include "content/public/browser/media_observer.h"
 #include "content/public/browser/plugin_service_filter.h"
 #include "content/public/browser/quota_permission_context.h"
 #include "content/public/browser/render_process_host.h"
@@ -216,35 +216,6 @@ class CefPluginServiceFilter : public content::PluginServiceFilter {
 }  // namespace
 
 
-class CefMediaObserver : public content::MediaObserver {
- public:
-  CefMediaObserver() {}
-  virtual ~CefMediaObserver() {}
-
-  virtual void OnCaptureDevicesOpened(
-      int render_process_id,
-      int render_view_id,
-      const content::MediaStreamDevices& devices) OVERRIDE {}
-  virtual void OnCaptureDevicesClosed(
-      int render_process_id,
-      int render_view_id,
-      const content::MediaStreamDevices& devices) OVERRIDE {}
-  virtual void OnAudioCaptureDevicesChanged(
-      const content::MediaStreamDevices& devices) OVERRIDE {}
-  virtual void OnVideoCaptureDevicesChanged(
-      const content::MediaStreamDevices& devices) OVERRIDE {}
-  virtual void OnMediaRequestStateChanged(
-      int render_process_id,
-      int render_view_id,
-      const content::MediaStreamDevice& device,
-      content::MediaRequestState state) OVERRIDE {}
-  virtual void OnAudioStreamPlayingChanged(
-      int render_process_id,
-      int render_view_id,
-      int stream_id,
-      bool playing) OVERRIDE {}
-};
-
 CefContentBrowserClient::CefContentBrowserClient()
     : browser_main_parts_(NULL),
       next_browser_id_(0) {
@@ -490,10 +461,7 @@ content::QuotaPermissionContext*
 }
 
 content::MediaObserver* CefContentBrowserClient::GetMediaObserver() {
-  // TODO(cef): Return NULL once it's supported. See crbug.com/116113.
+  return CefMediaCaptureDevicesDispatcher::GetInstance();
-  if (!media_observer_.get())
-     media_observer_.reset(new CefMediaObserver());
-  return media_observer_.get();
 }
 
 content::AccessTokenStore* CefContentBrowserClient::CreateAccessTokenStore() {

libcef/browser/content_browser_client.h

@@ -21,7 +21,6 @@
 class CefBrowserContext;
 class CefBrowserInfo;
 class CefBrowserMainParts;
-class CefMediaObserver;
 class CefResourceDispatcherHostDelegate;
 
 namespace content {
@@ -134,7 +133,6 @@ class CefContentBrowserClient : public content::ContentBrowserClient {
 
   CefBrowserMainParts* browser_main_parts_;
 
-  scoped_ptr<CefMediaObserver> media_observer_;
   scoped_ptr<content::PluginServiceFilter> plugin_service_filter_;
   scoped_ptr<CefResourceDispatcherHostDelegate>
       resource_dispatcher_host_delegate_;

libcef/browser/context.cc

@@ -309,6 +309,10 @@ scoped_ptr<net::ProxyConfigService> CefContext::proxy_config_service() const {
       proxy_config_service();
 }
 
+PrefService* CefContext::pref_service() const {
+  return main_delegate_->browser_client()->browser_main_parts()->pref_service();
+}
+
 CefTraceSubscriber* CefContext::GetTraceSubscriber() {
   CEF_REQUIRE_UIT();
   if (shutting_down_)

libcef/browser/context.h

@@ -33,6 +33,7 @@ class CefBrowserHostImpl;
 class CefDevToolsDelegate;
 class CefMainDelegate;
 class CefTraceSubscriber;
+class PrefService;
 
 class CefContext : public CefBase {
  public:
@@ -67,6 +68,7 @@ class CefContext : public CefBase {
   CefRefPtr<CefApp> application() const;
   CefBrowserContext* browser_context() const;
   CefDevToolsDelegate* devtools_delegate() const;
+  PrefService* pref_service() const;
 
   scoped_refptr<net::URLRequestContextGetter> request_context() const {
     return request_context_;

libcef/browser/media_capture_devices_dispatcher.cc

@@ -0,0 +1,216 @@
+// Copyright (c) 2012 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/media_capture_devices_dispatcher.h"
+
+#include "base/prefs/pref_registry_simple.h"
+#include "base/prefs/pref_service.h"
+#include "chrome/common/pref_names.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/media_devices_monitor.h"
+#include "content/public/common/media_stream_request.h"
+
+using content::BrowserThread;
+using content::MediaStreamDevices;
+
+namespace {
+
+const content::MediaStreamDevice* FindDefaultDeviceWithId(
+    const content::MediaStreamDevices& devices,
+    const std::string& device_id) {
+  if (devices.empty())
+    return NULL;
+
+  content::MediaStreamDevices::const_iterator iter = devices.begin();
+  for (; iter != devices.end(); ++iter) {
+    if (iter->id == device_id) {
+      return &(*iter);
+    }
+  }
+
+  return &(*devices.begin());
+};
+
+}  // namespace
+
+
+CefMediaCaptureDevicesDispatcher*
+    CefMediaCaptureDevicesDispatcher::GetInstance() {
+  return Singleton<CefMediaCaptureDevicesDispatcher>::get();
+}
+
+CefMediaCaptureDevicesDispatcher::CefMediaCaptureDevicesDispatcher()
+    : devices_enumerated_(false) {}
+
+CefMediaCaptureDevicesDispatcher::~CefMediaCaptureDevicesDispatcher() {}
+
+void CefMediaCaptureDevicesDispatcher::RegisterPrefs(
+    PrefRegistrySimple* registry) {
+  registry->RegisterStringPref(prefs::kDefaultAudioCaptureDevice,
+                               std::string());
+  registry->RegisterStringPref(prefs::kDefaultVideoCaptureDevice,
+                               std::string());
+}
+
+void CefMediaCaptureDevicesDispatcher::AddObserver(Observer* observer) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  if (!observers_.HasObserver(observer))
+    observers_.AddObserver(observer);
+}
+
+void CefMediaCaptureDevicesDispatcher::RemoveObserver(Observer* observer) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  observers_.RemoveObserver(observer);
+}
+
+const MediaStreamDevices&
+CefMediaCaptureDevicesDispatcher::GetAudioCaptureDevices() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  if (!devices_enumerated_) {
+    BrowserThread::PostTask(
+        BrowserThread::IO, FROM_HERE,
+        base::Bind(&content::EnsureMonitorCaptureDevices));
+    devices_enumerated_ = true;
+  }
+  return audio_devices_;
+}
+
+const MediaStreamDevices&
+CefMediaCaptureDevicesDispatcher::GetVideoCaptureDevices() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  if (!devices_enumerated_) {
+    BrowserThread::PostTask(
+        BrowserThread::IO, FROM_HERE,
+        base::Bind(&content::EnsureMonitorCaptureDevices));
+    devices_enumerated_ = true;
+  }
+  return video_devices_;
+}
+
+void CefMediaCaptureDevicesDispatcher::GetDefaultDevices(
+    PrefService* prefs,
+    bool audio,
+    bool video,
+    content::MediaStreamDevices* devices) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(audio || video);
+
+  std::string default_device;
+  if (audio) {
+    default_device = prefs->GetString(prefs::kDefaultAudioCaptureDevice);
+    GetRequestedDevice(default_device, true, false, devices);
+  }
+
+  if (video) {
+    default_device = prefs->GetString(prefs::kDefaultVideoCaptureDevice);
+    GetRequestedDevice(default_device, false, true, devices);
+  }
+}
+
+void CefMediaCaptureDevicesDispatcher::GetRequestedDevice(
+    const std::string& requested_device_id,
+    bool audio,
+    bool video,
+    content::MediaStreamDevices* devices) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK(audio || video);
+
+  if (audio) {
+    const content::MediaStreamDevices& audio_devices = GetAudioCaptureDevices();
+    const content::MediaStreamDevice* const device =
+        FindDefaultDeviceWithId(audio_devices, requested_device_id);
+    if (device)
+      devices->push_back(*device);
+  }
+  if (video) {
+    const content::MediaStreamDevices& video_devices = GetVideoCaptureDevices();
+    const content::MediaStreamDevice* const device =
+        FindDefaultDeviceWithId(video_devices, requested_device_id);
+    if (device)
+      devices->push_back(*device);
+  }
+}
+
+void CefMediaCaptureDevicesDispatcher::OnCaptureDevicesOpened(
+    int render_process_id,
+    int render_view_id,
+    const content::MediaStreamDevices& devices) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+}
+
+void CefMediaCaptureDevicesDispatcher::OnCaptureDevicesClosed(
+    int render_process_id,
+    int render_view_id,
+    const content::MediaStreamDevices& devices) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+}
+
+void CefMediaCaptureDevicesDispatcher::OnAudioCaptureDevicesChanged(
+    const content::MediaStreamDevices& devices) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(
+          &CefMediaCaptureDevicesDispatcher::UpdateAudioDevicesOnUIThread,
+          base::Unretained(this), devices));
+}
+
+void CefMediaCaptureDevicesDispatcher::OnVideoCaptureDevicesChanged(
+    const content::MediaStreamDevices& devices) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(
+          &CefMediaCaptureDevicesDispatcher::UpdateVideoDevicesOnUIThread,
+          base::Unretained(this), devices));
+}
+
+void CefMediaCaptureDevicesDispatcher::OnMediaRequestStateChanged(
+    int render_process_id,
+    int render_view_id,
+    const content::MediaStreamDevice& device,
+    content::MediaRequestState state) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(
+          &CefMediaCaptureDevicesDispatcher::UpdateMediaRequestStateOnUIThread,
+          base::Unretained(this), render_process_id, render_view_id, device,
+          state));
+
+}
+
+void CefMediaCaptureDevicesDispatcher::OnAudioStreamPlayingChanged(
+    int render_process_id, int render_view_id, int stream_id, bool playing) {
+}
+
+void CefMediaCaptureDevicesDispatcher::UpdateAudioDevicesOnUIThread(
+    const content::MediaStreamDevices& devices) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  devices_enumerated_ = true;
+  audio_devices_ = devices;
+  FOR_EACH_OBSERVER(Observer, observers_,
+                    OnUpdateAudioDevices(audio_devices_));
+}
+
+void CefMediaCaptureDevicesDispatcher::UpdateVideoDevicesOnUIThread(
+    const content::MediaStreamDevices& devices){
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  devices_enumerated_ = true;
+  video_devices_ = devices;
+  FOR_EACH_OBSERVER(Observer, observers_,
+                    OnUpdateVideoDevices(video_devices_));
+}
+
+void CefMediaCaptureDevicesDispatcher::UpdateMediaRequestStateOnUIThread(
+    int render_process_id,
+    int render_view_id,
+    const content::MediaStreamDevice& device,
+    content::MediaRequestState state) {
+  FOR_EACH_OBSERVER(Observer, observers_,
+                    OnRequestUpdate(render_process_id,
+                                    render_view_id,
+                                    device,
+                                    state));
+}

libcef/browser/media_capture_devices_dispatcher.h

@@ -0,0 +1,128 @@
+// Copyright (c) 2012 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_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
+#define CEF_LIBCEF_BROWSER_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/singleton.h"
+#include "base/observer_list.h"
+#include "content/public/browser/media_observer.h"
+#include "content/public/common/media_stream_request.h"
+
+class PrefRegistrySimple;
+class PrefService;
+
+// This singleton is used to receive updates about media events from the content
+// layer. Based on chrome/browser/media/media_capture_devices_dispatcher.[h|cc].
+class CefMediaCaptureDevicesDispatcher : public content::MediaObserver {
+ public:
+  class Observer {
+   public:
+    // Handle an information update consisting of a up-to-date audio capture
+    // device lists. This happens when a microphone is plugged in or unplugged.
+    virtual void OnUpdateAudioDevices(
+        const content::MediaStreamDevices& devices) {}
+
+    // Handle an information update consisting of a up-to-date video capture
+    // device lists. This happens when a camera is plugged in or unplugged.
+    virtual void OnUpdateVideoDevices(
+        const content::MediaStreamDevices& devices) {}
+
+    // Handle an information update related to a media stream request.
+    virtual void OnRequestUpdate(
+        int render_process_id,
+        int render_view_id,
+        const content::MediaStreamDevice& device,
+        const content::MediaRequestState state) {}
+
+    virtual ~Observer() {}
+  };
+
+  static CefMediaCaptureDevicesDispatcher* GetInstance();
+
+  // Registers the preferences related to Media Stream default devices.
+  static void RegisterPrefs(PrefRegistrySimple* registry);
+
+  // Methods for observers. Called on UI thread.
+  // Observers should add themselves on construction and remove themselves
+  // on destruction.
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+  const content::MediaStreamDevices& GetAudioCaptureDevices();
+  const content::MediaStreamDevices& GetVideoCaptureDevices();
+
+  // Helper to get the default devices which can be used by the media request,
+  // if the return list is empty, it means there is no available device on the
+  // OS.
+  // Called on the UI thread.
+  void GetDefaultDevices(PrefService* prefs,
+                         bool audio,
+                         bool video,
+                         content::MediaStreamDevices* devices);
+
+  // Helper for picking the device that was requested for an OpenDevice request.
+  // If the device requested is not available it will revert to using the first
+  // available one instead or will return an empty list if no devices of the
+  // requested kind are present.
+  void GetRequestedDevice(const std::string& requested_device_id,
+                          bool audio,
+                          bool video,
+                          content::MediaStreamDevices* devices);
+
+  // Overridden from content::MediaObserver:
+  virtual void OnCaptureDevicesOpened(
+      int render_process_id,
+      int render_view_id,
+      const content::MediaStreamDevices& devices) OVERRIDE;
+  virtual void OnCaptureDevicesClosed(
+      int render_process_id,
+      int render_view_id,
+      const content::MediaStreamDevices& devices) OVERRIDE;
+  virtual void OnAudioCaptureDevicesChanged(
+      const content::MediaStreamDevices& devices) OVERRIDE;
+  virtual void OnVideoCaptureDevicesChanged(
+      const content::MediaStreamDevices& devices) OVERRIDE;
+  virtual void OnMediaRequestStateChanged(
+      int render_process_id,
+      int render_view_id,
+      const content::MediaStreamDevice& device,
+      content::MediaRequestState state) OVERRIDE;
+  virtual void OnAudioStreamPlayingChanged(
+      int render_process_id,
+      int render_view_id,
+      int stream_id,
+      bool playing) OVERRIDE;
+
+ private:
+  friend struct DefaultSingletonTraits<CefMediaCaptureDevicesDispatcher>;
+
+  CefMediaCaptureDevicesDispatcher();
+  virtual ~CefMediaCaptureDevicesDispatcher();
+
+  // Called by the MediaObserver() functions, executed on UI thread.
+  void UpdateAudioDevicesOnUIThread(const content::MediaStreamDevices& devices);
+  void UpdateVideoDevicesOnUIThread(const content::MediaStreamDevices& devices);
+  void UpdateMediaRequestStateOnUIThread(
+      int render_process_id,
+      int render_view_id,
+      const content::MediaStreamDevice& device,
+      content::MediaRequestState state);
+
+  // A list of cached audio capture devices.
+  content::MediaStreamDevices audio_devices_;
+
+  // A list of cached video capture devices.
+  content::MediaStreamDevices video_devices_;
+
+  // A list of observers for the device update notifications.
+  ObserverList<Observer> observers_;
+
+  // Flag to indicate if device enumeration has been done/doing.
+  // Only accessed on UI thread.
+  bool devices_enumerated_;
+};
+
+#endif  // CEF_LIBCEF_BROWSER_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_

libcef/common/cef_switches.cc

@@ -86,4 +86,7 @@ const char kDisableDeveloperTools[]       = "disable-developer-tools";
 // Persist session cookies.
 const char kPersistSessionCookies[]       = "persist-session-cookies";
 
+// Enable media (WebRTC audio/video) streaming.
+const char kEnableMediaStream[]           = "enable-media-stream";
+
 }  // namespace switches

libcef/common/cef_switches.h

@@ -39,6 +39,7 @@ extern const char kDisableTabToLinks[];
 extern const char kDisableAuthorAndUserStyles[];
 extern const char kDisableDeveloperTools[];
 extern const char kPersistSessionCookies[];
+extern const char kEnableMediaStream[];
 
 }  // namespace switches