Send size to NativeViewportClient::OnCreated instead of GLES2Client::DidCreateContext

mojo/services/native_viewport/native_viewport.mojom

 // Copyright 2013 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.
 
 module mojo {
 
 struct Point {
   float x;
   float y;
 };
@@ skipping 12 matching lines @@
 [Peer=NativeViewportClient]
 interface NativeViewport {
   void Open();
   void Close();
   void CreateGLES2Context(handle<message_pipe> gles2_client);
   void AckEvent(Event event);
 };
 
 [Peer=NativeViewport]
 interface NativeViewportClient {
-  void OnCreated();
+  void OnCreated(uint32 width, uint32 height);
   void OnDestroyed();
   void OnEvent(Event event);
 };
 
 }