[MediaSession] Add playbackState attribute to Blink MediaSession and use it to determine playback s…

content/browser/media/session/media_session_impl.h

Index: content/browser/media/session/media_session_impl.h
diff --git a/content/browser/media/session/media_session_impl.h b/content/browser/media/session/media_session_impl.h
index a7dc62df32182b9fffa4ccf29516cc110ea6a90f..60c3fee6130686aa2152094c9a9eec96a30805b2 100644
--- a/content/browser/media/session/media_session_impl.h
+++ b/content/browser/media/session/media_session_impl.h
@@ -176,6 +176,11 @@ class MediaSessionImpl : public MediaSession,
   // from this session.
   void OnServiceDestroyed(MediaSessionServiceImpl* service);
 
+  // Called when the advertised playback state of a MediaSessionService has

[mlamouri (slow - plz ping), 2016/12/16 15:49:13]

s/advertised//

[Zhiqiang Zhang (Slow), 2016/12/16 18:26:15]

Done.

+  // changed. Will notify observers of media session state change.
+  void OnMediaSessionAdvertisedPlaybackStateChanged(

[mlamouri (slow - plz ping), 2016/12/16 15:49:14]

ditto

[Zhiqiang Zhang (Slow), 2016/12/16 18:26:15]

Done.

+      MediaSessionServiceImpl* service);
+
   // Called when the metadata of a MediaSessionService has changed. Will notify
   // observers if the service is currently routed.
   void OnMediaSessionMetadataChanged(MediaSessionServiceImpl* service);