Restart fullscreen video playback when switching back from background

content/renderer/media/android/renderer_media_player_manager.h

 // Copyright 2013 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_RENDERER_MEDIA_ANDROID_RENDERER_MEDIA_PLAYER_MANAGER_H_
 #define CONTENT_RENDERER_MEDIA_ANDROID_RENDERER_MEDIA_PLAYER_MANAGER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 95 matching lines @@
   // Registers and unregisters a WebMediaPlayerAndroid object.
   int RegisterMediaPlayer(WebMediaPlayerAndroid* player);
   void UnregisterMediaPlayer(int player_id);
 
   // Registers a ProxyMediaKeys object. There must be a WebMediaPlayerAndroid
   // object already registered for this id, and it is unregistered when the
   // player is unregistered. For now |media_keys_id| is the same as player_id
   // 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();
 
   // Checks whether a player can enter fullscreen.
   bool CanEnterFullscreen(blink::WebFrame* frame);
 
   // Called when a player entered or exited fullscreen.
   void DidEnterFullscreen(blink::WebFrame* frame);
   void DidExitFullscreen();
@@ skipping 51 matching lines @@
   // Info for all available WebMediaPlayerAndroid on a page; kept so that
   // we can enumerate them to send updates about tab focus and visibility.
   std::map<int, WebMediaPlayerAndroid*> media_players_;
 
   // Info for all available ProxyMediaKeys. There must be at most one
   // ProxyMediaKeys for each available WebMediaPlayerAndroid.
   std::map<int, ProxyMediaKeys*> media_keys_;
 
   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_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererMediaPlayerManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_ANDROID_RENDERER_MEDIA_PLAYER_MANAGER_H_