Move views::Accelerator to ui in order to use it from aura code.

views/accelerator.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.
-
-// This class describe a keyboard accelerator (or keyboard shortcut).
-// Keyboard accelerators are registered with the FocusManager.
-// It has a copy constructor and assignment operator so that it can be copied.
-// It also defines the < operator so that it can be used as a key in a std::map.
-//
-
-#ifndef VIEWS_ACCELERATOR_H_
-#define VIEWS_ACCELERATOR_H_
-#pragma once
-
-#include <string>
-
-#include "base/string16.h"
-#include "ui/base/models/accelerator.h"
-#include "views/events/event.h"
-#include "views/views_export.h"
-
-namespace views {
-
-class VIEWS_EXPORT Accelerator : public ui::Accelerator {
- public:
-  Accelerator() : ui::Accelerator() {}
-
-  Accelerator(ui::KeyboardCode keycode, int modifiers)
-      : ui::Accelerator(keycode, modifiers) {}
-
-  Accelerator(ui::KeyboardCode keycode,
-              bool shift_pressed, bool ctrl_pressed, bool alt_pressed) {
-    key_code_ = keycode;
-    modifiers_ = 0;
-    if (shift_pressed)
-      modifiers_ |= ui::EF_SHIFT_DOWN;
-    if (ctrl_pressed)
-      modifiers_ |= ui::EF_CONTROL_DOWN;
-    if (alt_pressed)
-      modifiers_ |= ui::EF_ALT_DOWN;
-  }
-
-  virtual ~Accelerator() {}
-
-  bool IsShiftDown() const {
-    return (modifiers_ & ui::EF_SHIFT_DOWN) == ui::EF_SHIFT_DOWN;
-  }
-
-  bool IsCtrlDown() const {
-    return (modifiers_ & ui::EF_CONTROL_DOWN) == ui::EF_CONTROL_DOWN;
-  }
-
-  bool IsAltDown() const {
-    return (modifiers_ & ui::EF_ALT_DOWN) == ui::EF_ALT_DOWN;
-  }
-
-  // Returns a string with the localized shortcut if any.
-  string16 GetShortcutText() const;
-};
-
-// An interface that classes that want to register for keyboard accelerators
-// should implement.
-class VIEWS_EXPORT AcceleratorTarget {
- public:
-  // This method should return true if the accelerator was processed.
-  virtual bool AcceleratorPressed(const Accelerator& accelerator) = 0;
-
- protected:
-  virtual ~AcceleratorTarget() {}
-};
-}
-
-#endif  // VIEWS_ACCELERATOR_H_