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

content/browser/media/session/mock_media_session_player_observer.h

 // Copyright 2016 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 <stddef.h>
 #include <vector>
 
 #include "content/browser/media/session/media_session_player_observer.h"
 
 namespace content {
 
 // MockMediaSessionPlayerObserver is a mock implementation of
 // MediaSessionPlayerObserver to be used in tests.
 class MockMediaSessionPlayerObserver : public MediaSessionPlayerObserver {
  public:
-  MockMediaSessionPlayerObserver();
+  explicit MockMediaSessionPlayerObserver(
+      RenderFrameHost* render_frame_host = nullptr);
   ~MockMediaSessionPlayerObserver() override;
 
   // Implements MediaSessionPlayerObserver.
   void OnSuspend(int player_id) override;
   void OnResume(int player_id) override;
   void OnSetVolumeMultiplier(int player_id, double volume_multiplier) override;
   RenderFrameHost* GetRenderFrameHost() const override;
 
   // Simulate that a new player started.
   // Returns the player_id.
@@ skipping 18 matching lines @@
     MockPlayer(bool is_playing = true, double volume_multiplier = 1.0f)
         : is_playing_(is_playing), volume_multiplier_(volume_multiplier) {}
     bool is_playing_;
     double volume_multiplier_;
   };
 
   // Basic representation of the players. The position in the vector is the
   // player_id. The value of the vector is the playing status and volume.
   std::vector<MockPlayer> players_;
 
+  RenderFrameHost* render_frame_host_;
+
   int received_resume_calls_ = 0;
   int received_suspend_calls_ = 0;
 };
 
 }  // namespace content