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

mojo/examples/aura_demo/aura_demo.cc

 // 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.
 
 #include <stdio.h>
 #include <string>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 121 matching lines @@
     AllocationScope scope;
     shell_->Connect("mojo:mojo_native_viewport_service", client_handle.Pass());
   }
 
   virtual void AcceptConnection(ScopedMessagePipeHandle handle) MOJO_OVERRIDE {
     NOTREACHED() << "AuraDemo can't be connected to.";
   }
 
  private:
   void HostContextCreated() {
-    aura::RootWindow::CreateParams params(gfx::Rect(0, 0, 500, 500));
+    aura::RootWindow::CreateParams params(
+        gfx::Rect(root_window_host_->bounds().size()));
     params.host = root_window_host_.get();
     root_window_.reset(new aura::RootWindow(params));
     root_window_host_->set_delegate(root_window_.get());
     root_window_->Init();
 
     window_tree_client_.reset(new DemoWindowTreeClient(root_window_->window()));
 
     delegate1_.reset(new DemoWindowDelegate(SK_ColorBLUE));
     window1_ = new aura::Window(delegate1_.get());
     window1_->Init(aura::WINDOW_LAYER_TEXTURED);
@@ skipping 48 matching lines @@
   // TODO(beng): This crashes in a DCHECK on X11 because this thread's
   //             MessageLoop is not of TYPE_UI. I think we need a way to build
   //             Aura that doesn't define platform-specific stuff.
   aura::Env::CreateInstance();
   mojo::examples::AuraDemo app(
       mojo::MakeScopedHandle(mojo::MessagePipeHandle(shell_handle)).Pass());
   loop.Run();
 
   return MOJO_RESULT_OK;
 }