Allow MediaSession in iframes to be routed

content/browser/media/session/media_session_controller.cc

 // Copyright 2016 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.
 
 #include "content/browser/media/session/media_session_controller.h"
 
 #include "content/browser/media/media_web_contents_observer.h"
 #include "content/browser/media/session/media_session_impl.h"
 #include "content/common/media/media_player_delegate_messages.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 77 matching lines @@
 }
 
 void MediaSessionController::OnSetVolumeMultiplier(int player_id,
                                                    double volume_multiplier) {
   DCHECK_EQ(player_id_, player_id);
   media_web_contents_observer_->Send(
       new MediaPlayerDelegateMsg_UpdateVolumeMultiplier(
           id_.first->GetRoutingID(), id_.second, volume_multiplier));
 }
 
+RenderFrameHost* MediaSessionController::GetRenderFrameHost() const {
+  return id_.first;
+}
+
 void MediaSessionController::OnPlaybackPaused() {
   // We check for suspension here since the renderer may issue its own pause
   // in response to or while a pause from the browser is in flight.
   if (!media_session_->IsSuspended())
     media_session_->OnPlayerPaused(this, player_id_);
 }
 
 }  // namespace content