Cast: Flow hw encoder initialization error to extensions API

media/cast/cast_sender_impl.h

Index: media/cast/cast_sender_impl.h
diff --git a/media/cast/cast_sender_impl.h b/media/cast/cast_sender_impl.h
index c4680abf16281b7c9e9ca3199d6316f2984d7b75..e3f16fea2f8a42f14f776b4c90c78d7dcd853f46 100644
--- a/media/cast/cast_sender_impl.h
+++ b/media/cast/cast_sender_impl.h
@@ -47,6 +47,9 @@ class CastSenderImpl : public CastSender {
 
  private:
   void ReceivedPacket(scoped_ptr<Packet> packet);
+  void OnVideoInitialized(
+      const CastInitializationCallback& initialization_cb,
+      media::cast::CastInitializationStatus result);
 
   CastInitializationCallback initialization_callback_;
   scoped_ptr<AudioSender> audio_sender_;
@@ -57,8 +60,6 @@ class CastSenderImpl : public CastSender {
   // The transport sender is owned by the owner of the CastSender, and should be
   // valid throughout the lifetime of the CastSender.
   CastTransportSender* const transport_sender_;
-  uint32 ssrc_of_audio_sender_;
-  uint32 ssrc_of_video_sender_;
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<CastSenderImpl> weak_factory_;