Restart fullscreen video playback when switching back from background

content/renderer/media/android/renderer_media_player_manager.h

Index: content/renderer/media/android/renderer_media_player_manager.h
diff --git a/content/renderer/media/android/renderer_media_player_manager.h b/content/renderer/media/android/renderer_media_player_manager.h
index 6830a715931de19ad3366a7a617217be9c727773..3937b5bc115ca195c0da479f2e71a7ab8fb3cbf1 100644
--- a/content/renderer/media/android/renderer_media_player_manager.h
+++ b/content/renderer/media/android/renderer_media_player_manager.h
@@ -113,6 +113,14 @@ class RendererMediaPlayerManager : public RenderViewObserver {
   // used in other methods.
   void RegisterMediaKeys(int media_keys_id, ProxyMediaKeys* media_keys);
 
+  // Requests the player that is currently entered fullscreen (if any)
+  // to exit.
+  void SuspendFullscreenVideo();
+
+  // Requests the player that exited fullscreen in result of
+  // SuspendFullscreen (if any) to reenter.
+  void ResumeFullscreenVideo();
+
   // Releases the media resources managed by this object when a video
   // is playing.
   void ReleaseVideoResources();
@@ -184,6 +192,13 @@ class RendererMediaPlayerManager : public RenderViewObserver {
 
   int next_media_player_id_;
 
+  // ID of the player that entered fullscreen.
+  int fullscreen_player_id_;
+
+  // Preserves the value of fullscreen_player_id_ between PauseVideo
+  // and ResumeVideo.
+  int paused_fullscreen_player_id_;
+
   // WebFrame of the fullscreen video.
   blink::WebFrame* fullscreen_frame_;