Move Aura to UI subdir.

aura/desktop_host.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 AURA_DESKTOP_HOST_H_
-#define AURA_DESKTOP_HOST_H_
-#pragma once
-
-#include "base/message_loop.h"
-#include "ui/gfx/native_widget_types.h"
-
-namespace gfx {
-class Rect;
-class Size;
-}
-
-namespace aura {
-
-class Desktop;
-
-// DesktopHost bridges between a native window and the embedded Desktop. It
-// provides the accelerated widget and maps events from the native os to aura.
-class DesktopHost : public MessageLoop::Dispatcher {
- public:
-  virtual ~DesktopHost() {}
-
-  // Creates a new DesktopHost. The caller owns the returned value.
-  static DesktopHost* Create(const gfx::Rect& bounds);
-
-  // Sets the Desktop this DesktopHost is hosting. DesktopHost does not own the
-  // Desktop.
-  virtual void SetDesktop(Desktop* desktop) = 0;
-
-  // Returns the accelerated widget.
-  virtual gfx::AcceleratedWidget GetAcceleratedWidget() = 0;
-
-  // Shows the DesktopHost.
-  virtual void Show() = 0;
-
-  // Gets/Sets the size of the DesktopHost.
-  virtual gfx::Size GetSize() = 0;
-  virtual void SetSize(const gfx::Size& size) = 0;
-};
-
-}  // namespace aura
-
-#endif  // AURA_DESKTOP_HOST_H_