Adding new media controls to MediaNotification

content/browser/android/web_contents_observer_proxy.h

Index: content/browser/android/web_contents_observer_proxy.h
diff --git a/content/browser/android/web_contents_observer_proxy.h b/content/browser/android/web_contents_observer_proxy.h
index c6ab66ebd0bb5db648209aff97379fb5f52e2ae3..b85f41947e722e4509d93c3555bdf92d8abb26a6 100644
--- a/content/browser/android/web_contents_observer_proxy.h
+++ b/content/browser/android/web_contents_observer_proxy.h
@@ -78,6 +78,10 @@ class WebContentsObserverProxy : public WebContentsObserver {
                                 bool is_suspended) override;
   void MediaSessionMetadataChanged(
       const base::Optional<MediaMetadata>& metadata) override;
+  void MediaSessionEnabledAction(

[whywhat, 2016/10/24 21:01:25]

hm, what's the plan of getting rid of those?
is it because you're waiting on the Chromecast changes?
I'd say they will have to fix it in their downstream tree when rolling Chromium
so you could remove WebContentsObserver at the same time you add MSO?

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

Yes, the plan is to get rid of these from both WebContents and
WebContentsObserver.

+      blink::mojom::MediaSessionAction action) override;
+  void MediaSessionDisabledAction(
+      blink::mojom::MediaSessionAction action) override;
   void SetToBaseURLForDataURLIfNeeded(std::string* url);
 
   void DidFailLoadInternal(bool is_provisional_load,