NOT FOR LANDING Implement WebMediaSession

content/browser/web_contents/web_contents_impl.cc

 // 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.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <stddef.h>
 
 #include <cmath>
 #include <utility>
@@ skipping 3497 matching lines @@
       static_cast<RenderViewHostImpl*>(render_view_message_source_);
   if (!rvhi->is_active())
     return;
 
   FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                     DidUpdateFaviconURL(candidates));
 }
 
 #if defined(OS_ANDROID)
 
-void WebContentsImpl::OnMediaSessionStateChanged() {
-  MediaSession* session = MediaSession::Get(this);
+void WebContentsImpl::OnMediaSessionStateChanged(MediaSession* session) {
   FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                     MediaSessionStateChanged(session->IsControllable(),
                                              session->IsSuspended()));
 }
 
 void WebContentsImpl::ResumeMediaSession() {
   MediaSession::Get(this)->Resume();
 }
 
 void WebContentsImpl::SuspendMediaSession() {
@@ skipping 1214 matching lines @@
     const WebContentsObserver::MediaPlayerId& id) {
   FOR_EACH_OBSERVER(WebContentsObserver, observers_, MediaStartedPlaying(id));
 }
 
 void WebContentsImpl::MediaStoppedPlaying(
     const WebContentsObserver::MediaPlayerId& id) {
   FOR_EACH_OBSERVER(WebContentsObserver, observers_, MediaStoppedPlaying(id));
 }
 
 }  // namespace content