Pause EME player whose external surface is stolen by another player

content/public/browser/android/external_video_surface_container.h

Index: content/public/browser/android/external_video_surface_container.h
diff --git a/content/public/browser/android/external_video_surface_container.h b/content/public/browser/android/external_video_surface_container.h
index 38cbe5987bac76912dcae34ef3502e4e4ffe0f9a..a42aff2c0ff61cba1ec66ce44f4b3a45d9a9297c 100644
--- a/content/public/browser/android/external_video_surface_container.h
+++ b/content/public/browser/android/external_video_surface_container.h
@@ -32,9 +32,16 @@ class CONTENT_EXPORT ExternalVideoSurfaceContainer {
       const SurfaceCreatedCB& surface_created_cb,
       const SurfaceDestroyedCB& surface_destroyed_cb) = 0;
 
-  // Called when a media player wants to release an external video surface.
+  // Returns id of player currently using the external video surface.
+  virtual int GetCurrentPlayerId() = 0;
+
+  // Called when a media player wants to release a certain player's external
+  // video surface.
   virtual void ReleaseExternalVideoSurface(int player_id) = 0;
 
+  // Called when a media player wants to release current external video surface.
+  virtual void ReleaseCurrentExternalVideoSurface() = 0;
+
   // Called when the position and size of the video element which uses
   // the external video surface is changed.
   // |rect| contains the new position and size in css pixels.