Moves common view_manager related aura files to mojo/aura

mojo/examples/aura_demo/window_tree_host_view_manager.h

-// Copyright 2014 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 MOJO_EXAMPLES_AURA_DEMO_WINDOW_TREE_HOST_VIEW_MANAGER_H_
-#define MOJO_EXAMPLES_AURA_DEMO_WINDOW_TREE_HOST_VIEW_MANAGER_H_
-
-#include "ui/aura/window_tree_host.h"
-#include "ui/events/event_source.h"
-#include "ui/gfx/geometry/rect.h"
-
-namespace mojo {
-namespace examples {
-
-class WindowTreeHostViewManager : public aura::WindowTreeHost,
-                                  public ui::EventSource {
- public:
-  explicit WindowTreeHostViewManager(const gfx::Rect& bounds);
-  virtual ~WindowTreeHostViewManager();
-
-  const gfx::Rect& bounds() const { return bounds_; }
-
- private:
-  // WindowTreeHost:
-  virtual ui::EventSource* GetEventSource() OVERRIDE;
-  virtual gfx::AcceleratedWidget GetAcceleratedWidget() OVERRIDE;
-  virtual void Show() OVERRIDE;
-  virtual void Hide() OVERRIDE;
-  virtual gfx::Rect GetBounds() const OVERRIDE;
-  virtual void SetBounds(const gfx::Rect& bounds) OVERRIDE;
-  virtual gfx::Point GetLocationOnNativeScreen() const OVERRIDE;
-  virtual void SetCapture() OVERRIDE;
-  virtual void ReleaseCapture() OVERRIDE;
-  virtual void PostNativeEvent(const base::NativeEvent& native_event) OVERRIDE;
-  virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE;
-  virtual void SetCursorNative(gfx::NativeCursor cursor) OVERRIDE;
-  virtual void MoveCursorToNative(const gfx::Point& location) OVERRIDE;
-  virtual void OnCursorVisibilityChangedNative(bool show) OVERRIDE;
-
-  // ui::EventSource:
-  virtual ui::EventProcessor* GetEventProcessor() OVERRIDE;
-
-  gfx::Rect bounds_;
-
-  DISALLOW_COPY_AND_ASSIGN(WindowTreeHostViewManager);
-};
-
-}  // namespace examples
-}  // namespace mojo
-
-#endif  // MOJO_EXAMPLES_AURA_DEMO_WINDOW_TREE_HOST_VIEW_MANAGER_H_