Initialize message pump not to use gtk. WindowSizer for aura

ui/aura/desktop.h

 // Copyright (c) 2011 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.
 
 #ifndef UI_AURA_DESKTOP_H_
 #define UI_AURA_DESKTOP_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
@@ skipping 11 matching lines @@
 
 class DesktopHost;
 class MouseEvent;
 
 // Desktop is responsible for hosting a set of windows.
 class AURA_EXPORT Desktop : public ui::CompositorDelegate {
  public:
   Desktop();
   ~Desktop();
 
+  // Initializes the desktop.
+  void Init();
+
   // Shows the desktop host.
   void Show();
 
   // Sets the size of the desktop.
   void SetSize(const gfx::Size& size);
 
   // Shows the desktop host and runs an event loop for it.
   void Run();
 
   // Draws the necessary set of windows.
@@ skipping 29 matching lines @@
 
   // Used to schedule painting.
   ScopedRunnableMethodFactory<Desktop> schedule_paint_;
 
   DISALLOW_COPY_AND_ASSIGN(Desktop);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_DESKTOP_H_