Enables fullscreen subtitle and media control from Blink

content/browser/media/android/browser_media_player_manager.cc

Index: content/browser/media/android/browser_media_player_manager.cc
diff --git a/content/browser/media/android/browser_media_player_manager.cc b/content/browser/media/android/browser_media_player_manager.cc
index a89c0526c6f21ae40a9eadee4fd76d471c561f09..581d15e9967b10fbccb0805d59c6cfed122f9bda 100644
--- a/content/browser/media/android/browser_media_player_manager.cc
+++ b/content/browser/media/android/browser_media_player_manager.cc
@@ -146,6 +146,12 @@ void BrowserMediaPlayerManager::FullscreenPlayerSeek(int msec) {
 }
 
 void BrowserMediaPlayerManager::ExitFullscreen(bool release_media_player) {
+  render_view_host()->GetDelegate()->ToggleFullscreenMode(false);
+  RenderWidgetHostViewAndroid* view_android =
+      static_cast<RenderWidgetHostViewAndroid*>(render_view_host()->GetView());
+  if (view_android)
+    view_android->SetOverlayVideoMode(false);
+
   Send(new MediaPlayerMsg_DidExitFullscreen(
       routing_id(), fullscreen_player_id_));
   video_view_.reset();
@@ -173,6 +179,11 @@ void BrowserMediaPlayerManager::SetVideoSurface(
     Send(new MediaPlayerMsg_DidEnterFullscreen(
         routing_id(), player->player_id()));
   }
+  RenderWidgetHostViewAndroid* view_android =
+      static_cast<RenderWidgetHostViewAndroid*>(render_view_host()->GetView());
+  if (view_android)
+    view_android->SetOverlayVideoMode(true);
+  render_view_host()->GetDelegate()->ToggleFullscreenMode(true);
 }
 
 void BrowserMediaPlayerManager::OnMediaMetadataChanged(