Add 'autoplay' content settings and expose it to Blink.

chrome/renderer/content_settings_observer.h

 // 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 CHROME_RENDERER_CONTENT_SETTINGS_OBSERVER_H_
 #define CHROME_RENDERER_CONTENT_SETTINGS_OBSERVER_H_
 
 #include <map>
 #include <set>
 
@@ skipping 24 matching lines @@
       public content::RenderFrameObserverTracker<ContentSettingsObserver>,
       public blink::WebContentSettingsClient {
  public:
   // Set |should_whitelist| to true if |render_frame()| contains content that
   // should be whitelisted for content settings.
   ContentSettingsObserver(content::RenderFrame* render_frame,
                           extensions::Dispatcher* extension_dispatcher,
                           bool should_whitelist);
   ~ContentSettingsObserver() override;
 
-  // Sets the content setting rules which back |AllowImage()|, |AllowScript()|,
-  // and |AllowScriptFromSource()|. |content_setting_rules| must outlive this
-  // |ContentSettingsObserver|.
+  // Sets the content setting rules which back |allowImage()|, |allowScript()|,
+  // |allowScriptFromSource()| and |allowAutoplay()|. |content_setting_rules|
+  // must outlive this |ContentSettingsObserver|.
   void SetContentSettingRules(
       const RendererContentSettingRules* content_setting_rules);
 
   bool IsPluginTemporarilyAllowed(const std::string& identifier);
 
   // Sends an IPC notification that the specified content type was blocked.
   void DidBlockContentType(ContentSettingsType settings_type);
 
   // Sends an IPC notification that the specified content type was blocked
   // with additional metadata.
@@ skipping 19 matching lines @@
   bool allowWriteToClipboard(bool default_value) override;
   bool allowMutationEvents(bool default_value) override;
   void didNotAllowPlugins() override;
   void didNotAllowScript() override;
   void didUseKeygen() override;
   bool allowDisplayingInsecureContent(bool allowed_per_settings,
                                       const blink::WebURL& url) override;
   bool allowRunningInsecureContent(bool allowed_per_settings,
                                    const blink::WebSecurityOrigin& context,
                                    const blink::WebURL& url) override;
+  bool allowAutoplay(bool default_value) override;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ContentSettingsObserverTest, WhitelistedSchemes);
   FRIEND_TEST_ALL_PREFIXES(ChromeRenderViewTest,
                            ContentSettingsInterstitialPages);
   FRIEND_TEST_ALL_PREFIXES(ChromeRenderViewTest, PluginsTemporarilyAllowed);
 
   // RenderFrameObserver implementation.
   bool OnMessageReceived(const IPC::Message& message) override;
   void DidCommitProvisionalLoad(bool is_new_navigation,
@@ skipping 60 matching lines @@
   typedef std::map<int, blink::WebContentSettingCallbacks> PermissionRequestMap;
   PermissionRequestMap permission_requests_;
 
   // If true, IsWhitelistedForContentSettings will always return true.
   const bool should_whitelist_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentSettingsObserver);
 };
 
 #endif  // CHROME_RENDERER_CONTENT_SETTINGS_OBSERVER_H_