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

content/browser/media/session/mock_media_session_player_observer.h

Index: content/browser/media/session/mock_media_session_player_observer.h
diff --git a/content/browser/media/session/mock_media_session_player_observer.h b/content/browser/media/session/mock_media_session_player_observer.h
index b87cccceab2de27e06732912b2b9247788d0977a..fb10b9395094fd376a0443adebaa0369debb7cf8 100644
--- a/content/browser/media/session/mock_media_session_player_observer.h
+++ b/content/browser/media/session/mock_media_session_player_observer.h
@@ -13,7 +13,8 @@ namespace content {
 // MediaSessionPlayerObserver to be used in tests.
 class MockMediaSessionPlayerObserver : public MediaSessionPlayerObserver {
  public:
-  MockMediaSessionPlayerObserver();
+  explicit MockMediaSessionPlayerObserver(
+      RenderFrameHost* render_frame_host = nullptr);
   ~MockMediaSessionPlayerObserver() override;
 
   // Implements MediaSessionPlayerObserver.
@@ -52,6 +53,8 @@ class MockMediaSessionPlayerObserver : public MediaSessionPlayerObserver {
   // 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;
 };