Implement MediaSession on top of the WebMediaPlayerDelegate.

content/browser/media/media_web_contents_observer.cc

Index: content/browser/media/media_web_contents_observer.cc
diff --git a/content/browser/media/media_web_contents_observer.cc b/content/browser/media/media_web_contents_observer.cc
index 0591e25b73eaf5dcb8d5d1b5377f9708a6a38f77..562836ebc33dc4146289b094915afe17c857084d 100644
--- a/content/browser/media/media_web_contents_observer.cc
+++ b/content/browser/media/media_web_contents_observer.cc
@@ -41,6 +41,8 @@ bool MediaWebContentsObserver::OnMessageReceived(
   // TODO(dalecurtis): These should no longer be FrameHostMsg.
   IPC_BEGIN_MESSAGE_MAP_WITH_PARAM(MediaWebContentsObserver, msg,
                                    render_frame_host)
+    IPC_MESSAGE_HANDLER(FrameHostMsg_MediaDestroyedNotification,
+                        OnMediaDestroyedNotification)
     IPC_MESSAGE_HANDLER(FrameHostMsg_MediaPlayingNotification,
                         OnMediaPlayingNotification)
     IPC_MESSAGE_HANDLER(FrameHostMsg_MediaPausedNotification,
@@ -50,12 +52,19 @@ bool MediaWebContentsObserver::OnMessageReceived(
   return handled;
 }
 
+void MediaWebContentsObserver::OnMediaDestroyedNotification(
+    RenderFrameHost* render_frame_host,
+    int64_t player_cookie) {
+  OnMediaPausedNotification(render_frame_host, player_cookie, true);
+}
+
 void MediaWebContentsObserver::OnMediaPlayingNotification(
     RenderFrameHost* render_frame_host,
     int64_t player_cookie,
     bool has_video,
     bool has_audio,
-    bool is_remote) {
+    bool is_remote,
+    base::TimeDelta duration) {
   // Ignore the videos playing remotely and don't hold the wake lock for the
   // screen. TODO(dalecurtis): Is this correct? It means observers will not
   // receive play and pause messages.
@@ -91,7 +100,8 @@ void MediaWebContentsObserver::OnMediaPlayingNotification(
 
 void MediaWebContentsObserver::OnMediaPausedNotification(
     RenderFrameHost* render_frame_host,
-    int64_t player_cookie) {
+    int64_t player_cookie,
+    bool reached_end_of_stream) {
   const MediaPlayerId id(render_frame_host, player_cookie);
   const bool removed_audio = RemoveMediaPlayerEntry(id, &active_audio_players_);
   const bool removed_video = RemoveMediaPlayerEntry(id, &active_video_players_);