Update to Chromium revision 9cedf753 (#418732)

- Simplify usage of OnBeforePluginLoad (issue #2015)
- Switch crash reporting from crashpad to breakpad on Windows and OS X.
  Adds a new chrome_elf.dll dependency on Windows (issue #1995)
- Remove CefTextfield::GetPlaceholderTextColor() method which is no
  longer supported by Chromium.

libcef/browser/plugins/plugin_info_message_filter.cc

@@ -19,9 +19,9 @@
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "chrome/browser/plugins/plugin_finder.h"
+#include "chrome/browser/plugins/plugins_field_trial.h"
 #include "chrome/common/pref_names.h"
 #include "components/content_settings/core/browser/content_settings_utils.h"
-#include "components/content_settings/core/browser/plugins_field_trial.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/plugin_service.h"
@@ -310,7 +310,7 @@ void CefPluginInfoMessageFilter::Context::DecidePluginStatus(
 
   // TODO(tommycli): Remove once we deprecate the plugin ASK policy.
   bool legacy_ask_user = plugin_setting == CONTENT_SETTING_ASK;
-  plugin_setting = content_settings::PluginsFieldTrial::EffectiveContentSetting(
+  plugin_setting = PluginsFieldTrial::EffectiveContentSetting(
       CONTENT_SETTINGS_TYPE_PLUGINS, plugin_setting);
 
   DCHECK(plugin_setting != CONTENT_SETTING_DEFAULT);

libcef/browser/plugins/plugin_service_filter.cc

@@ -12,6 +12,8 @@
 #include "libcef/common/cef_messages.h"
 #include "libcef/common/content_client.h"
 
+#include "extensions/common/constants.h"
+
 CefPluginServiceFilter::CefPluginServiceFilter() {
 }
 
@@ -22,12 +24,25 @@ bool CefPluginServiceFilter::IsPluginAvailable(
     const GURL& url,
     const GURL& policy_url,
     content::WebPluginInfo* plugin) {
-  CefRefPtr<CefRequestContextHandler> handler =
-      reinterpret_cast<const CefResourceContext*>(context)->GetHandler();
+  CefResourceContext* resource_context = const_cast<CefResourceContext*>(
+      reinterpret_cast<const CefResourceContext*>(context));
 
+  bool allow_load = true;
+  if (resource_context->HasPluginLoadDecision(render_process_id, plugin->path,
+                                              &allow_load)) {
+    return allow_load;
+  }
+
+  CefRefPtr<CefRequestContextHandler> handler = resource_context->GetHandler();
   CefViewHostMsg_GetPluginInfo_Status status =
       CefViewHostMsg_GetPluginInfo_Status::kAllowed;
-  return IsPluginAvailable(handler.get(), url, policy_url, plugin, &status);
+  allow_load = IsPluginAvailable(handler.get(), url, policy_url, plugin,
+                                 &status);
+
+  resource_context->AddPluginLoadDecision(render_process_id, plugin->path,
+                                          allow_load);
+
+  return allow_load;
 }
 
 bool CefPluginServiceFilter::CanLoadPlugin(int render_process_id,
@@ -53,6 +68,15 @@ bool CefPluginServiceFilter::IsPluginAvailable(
     return true;
   }
 
+  if (!policy_url.is_empty() &&
+      policy_url.scheme() == extensions::kExtensionScheme) {
+    // Always allow extension origins to load plugins.
+    // TODO(extensions): Revisit this decision once CEF supports more than just
+    // the PDF extension.
+    *status = CefViewHostMsg_GetPluginInfo_Status::kAllowed;
+    return true;
+  }
+
   if (handler) {
     CefRefPtr<CefWebPluginInfoImpl> pluginInfo(
         new CefWebPluginInfoImpl(*plugin));

libcef/browser/plugins/plugin_service_filter.h

@@ -33,6 +33,7 @@ class CefPluginServiceFilter : public content::PluginServiceFilter {
 
   // Returns false if the plugin is not found or disabled. May call
   // CefRequestContextHandler::OnBeforePluginLoad if possible/necessary.
+  // See related discussion in issue #2015.
   bool IsPluginAvailable(CefRequestContextHandler* handler,
                          const GURL& url,
                          const GURL& policy_url,