Add VideoPacket struct for video packets. Refactor Decode interface to use it.

remoting/protocol/connection_to_client.h

Index: remoting/protocol/connection_to_client.h
diff --git a/remoting/protocol/connection_to_client.h b/remoting/protocol/connection_to_client.h
index ee8b1d7e4f6b4a6d632b3fcfefd37d768a168faf..ddec08ccd86a3be769fac6fce4afc0af821ca96e 100644
--- a/remoting/protocol/connection_to_client.h
+++ b/remoting/protocol/connection_to_client.h
@@ -63,9 +63,6 @@ class ConnectionToClient :
   // Returns the connection in use.
   virtual protocol::Session* session();
 
-  // Send information to the client for initialization.
-  virtual void SendInitClientMessage(int width, int height);
-
   // Send encoded update stream data to the viewer.
   virtual void SendVideoPacket(const VideoPacket& packet);