Restart fullscreen video playback when switching back from background

content/renderer/media/android/renderer_media_player_manager.cc

Index: content/renderer/media/android/renderer_media_player_manager.cc
diff --git a/content/renderer/media/android/renderer_media_player_manager.cc b/content/renderer/media/android/renderer_media_player_manager.cc
index d75a7e3656f473e421291e9ed97c5f31cde4a297..b1339cd8680012ce996844f0c82560441a08c4d0 100644
--- a/content/renderer/media/android/renderer_media_player_manager.cc
+++ b/content/renderer/media/android/renderer_media_player_manager.cc
@@ -17,6 +17,8 @@ namespace content {
 RendererMediaPlayerManager::RendererMediaPlayerManager(RenderView* render_view)
     : RenderViewObserver(render_view),
       next_media_player_id_(0),
+      fullscreen_player_id_(-1),
+      paused_fullscreen_player_id_(-1),
       fullscreen_frame_(NULL) {}
 
 RendererMediaPlayerManager::~RendererMediaPlayerManager() {
@@ -188,14 +190,18 @@ void RendererMediaPlayerManager::OnDisconnectedFromRemoteDevice(int player_id) {
 
 void RendererMediaPlayerManager::OnDidEnterFullscreen(int player_id) {
   WebMediaPlayerAndroid* player = GetMediaPlayer(player_id);
-  if (player)
+  if (player) {
+    fullscreen_player_id_ = player_id;
     player->OnDidEnterFullscreen();
+  }
 }
 
 void RendererMediaPlayerManager::OnDidExitFullscreen(int player_id) {
   WebMediaPlayerAndroid* player = GetMediaPlayer(player_id);
-  if (player)
+  if (player) {
+    fullscreen_player_id_ = -1;
     player->OnDidExitFullscreen();
+  }
 }
 
 void RendererMediaPlayerManager::OnPlayerPlay(int player_id) {
@@ -221,6 +227,7 @@ void RendererMediaPlayerManager::EnterFullscreen(int player_id) {
 }
 
 void RendererMediaPlayerManager::ExitFullscreen(int player_id) {
+  DCHECK(player_id == fullscreen_player_id_);
   Send(new MediaPlayerHostMsg_ExitFullscreen(routing_id(), player_id));
 }
 
@@ -323,6 +330,20 @@ void RendererMediaPlayerManager::RegisterMediaKeys(int media_keys_id,
   media_keys_[media_keys_id] = media_keys;
 }
 
+void RendererMediaPlayerManager::SuspendFullscreenVideo() {
+  if (fullscreen_player_id_ != -1) {
+    ExitFullscreen(fullscreen_player_id_);
+    paused_fullscreen_player_id_ = fullscreen_player_id_;
+  }
+}
+
+void RendererMediaPlayerManager::ResumeFullscreenVideo() {
+  if (paused_fullscreen_player_id_ != -1) {
+    EnterFullscreen(paused_fullscreen_player_id_);
+    paused_fullscreen_player_id_ = -1;
+  }
+}
+
 void RendererMediaPlayerManager::ReleaseVideoResources() {
   std::map<int, WebMediaPlayerAndroid*>::iterator player_it;
   for (player_it = media_players_.begin();