Adding new media controls to MediaNotification

content/browser/media/session/media_session.h

Index: content/browser/media/session/media_session.h
diff --git a/content/browser/media/session/media_session.h b/content/browser/media/session/media_session.h
index 9239c7854a18b18326e2c2983451e49490922982..226d7119b852542078630acef27df3b0f4e790dd 100644
--- a/content/browser/media/session/media_session.h
+++ b/content/browser/media/session/media_session.h
@@ -20,6 +20,12 @@
 
 class MediaSessionBrowserTest;
 
+namespace blink {
+namespace mojom {
+enum class MediaSessionAction;
+}  // namespace mojom
+}  // namespace blink
+
 namespace media {
 enum class MediaContentType;
 }  // namespace media
@@ -29,6 +35,7 @@ namespace content {
 class AudioFocusDelegate;
 class AudioFocusManagerTest;
 class MediaSessionPlayerObserver;
+class MediaSessionServiceImpl;
 class MediaSessionStateObserver;
 class MediaSessionVisibilityBrowserTest;
 
@@ -111,6 +118,17 @@ class MediaSession : public WebContentsObserver,
   // |type| represents the origin of the request.
   CONTENT_EXPORT void Stop(SuspendType suspend_type);
 
+  // Called when an action is enabled in blink::MediaSession and notify

[whywhat, 2016/10/24 21:01:26]

nit: "Called ... and notify ..." is not a valid syntax structure I believe.
Maybe s/Called/call as a quick fix?

[Zhiqiang Zhang (Slow), 2016/10/25 10:46:55]

Done.

+  // observers.
+  void OnMediaSessionEnabledAction(blink::mojom::MediaSessionAction action);
+
+  // Called when an action is disabled in blink::MediaSession and notify

[whywhat, 2016/10/24 21:01:26]

ditto

[Zhiqiang Zhang (Slow), 2016/10/25 10:46:55]

Done.

+  // observers.
+  void OnMediaSessionDisabledAction(blink::mojom::MediaSessionAction action);
+
+  // Received a media session action and forward to blink::MediaSession.
+  void DidReceiveAction(blink::mojom::MediaSessionAction action);
+
   // Let the media session start ducking such that the volume multiplier is
   // reduced.
   CONTENT_EXPORT void StartDucking();
@@ -148,6 +166,8 @@ class MediaSession : public WebContentsObserver,
   // WebContentsObserver implementation
   void WebContentsDestroyed() override;
 
+  void SetMediaSessionService(MediaSessionServiceImpl* service);
+
  private:
   friend class content::WebContentsUserData<MediaSession>;
   friend class ::MediaSessionBrowserTest;
@@ -237,6 +257,10 @@ class MediaSession : public WebContentsObserver,
   base::Optional<MediaMetadata> metadata_;
   base::CallbackList<void(State)> media_session_state_listeners_;
 
+  // The MediaSessionService this session is associated with (the service of the
+  // top-level frame).
+  MediaSessionServiceImpl* service_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaSession);
 };