NOT FOR LANDING Implement WebMediaSession

content/browser/media/android/media_session.h

 // Copyright 2015 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.
 
 #ifndef CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_SESSION_H_
 #define CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_SESSION_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
@@ skipping 28 matching lines @@
   };
 
   static bool RegisterMediaSession(JNIEnv* env);
 
   // Returns the MediaSession associated to this WebContents. Creates one if
   // none is currently available.
   static MediaSession* Get(WebContents* web_contents);
 
   ~MediaSession() override;
 
+  bool Activate();
+  void Deactivate();
+
   // Adds the given player to the current media session. Returns whether the
   // player was successfully added. If it returns false, AddPlayer() should be
   // called again later.
   bool AddPlayer(MediaSessionObserver* observer, int player_id, Type type);
 
   // Removes the given player from the current media session. Abandons audio
   // focus if that was the last player in the session.
   void RemovePlayer(MediaSessionObserver* observer, int player_id);
 
   // Removes all the players associated with |observer|. Abandons audio focus if
@@ skipping 91 matching lines @@
   State audio_focus_state_;
   SuspendType suspend_type_;
   Type audio_focus_type_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaSession);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_ANDROID_MEDIA_SESSION_H_