Allow MediaSession in iframes to be routed

content/browser/media/session/pepper_player_delegate.cc

Index: content/browser/media/session/pepper_player_delegate.cc
diff --git a/content/browser/media/session/pepper_player_delegate.cc b/content/browser/media/session/pepper_player_delegate.cc
index 7b95734faa6b4ac566c07915eb635076c4e5f221..55f03c5c8139fecfe783df5c681f0a72f483a901 100644
--- a/content/browser/media/session/pepper_player_delegate.cc
+++ b/content/browser/media/session/pepper_player_delegate.cc
@@ -59,6 +59,10 @@ void PepperPlayerDelegate::OnSetVolumeMultiplier(int player_id,
   SetVolume(player_id, volume_multiplier);
 }
 
+RenderFrameHost* PepperPlayerDelegate::GetRenderFrameHost() const {
+  return nullptr;

[whywhat, 2016/12/01 22:13:00]

if pepper player's RFH is always null, why do we iterate over them to find one
in media_session_impl.cc?

[Zhiqiang Zhang (Slow), 2016/12/02 14:17:28]

Ditto http://crbug.com/670273. Added a TODO here.

+}
+
 void PepperPlayerDelegate::SetVolume(int player_id, double volume) {
   contents_->Send(new FrameMsg_SetPepperVolume(
       contents_->GetMainFrame()->routing_id(), pp_instance_, volume));