Skeleton for app_list on OSX, and refactoring for enable_app_list=1 on OS=="mac".

ui/app_list/pulsing_block_view.h

-// Copyright (c) 2012 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_APP_LIST_PULSING_BLOCK_VIEW_H_
-#define UI_APP_LIST_PULSING_BLOCK_VIEW_H_
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/timer.h"
-#include "ui/views/view.h"
-
-namespace gfx {
-class Size;
-}
-
-namespace app_list {
-
-// PulsingBlockView shows a pulsing white block via layer animation.
-class PulsingBlockView : public views::View {
- public:
-  // Constructs a PulsingBlockView of |size|. If |start_delay| is true,
-  // starts the pulsing animation after a random delay.
-  PulsingBlockView(const gfx::Size& size, bool start_delay);
-  virtual ~PulsingBlockView();
-
- private:
-  void OnStartDelayTimer();
-
-  // views::View overrides:
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
-
-  base::OneShotTimer<PulsingBlockView> start_delay_timer_;
-
-  DISALLOW_COPY_AND_ASSIGN(PulsingBlockView);
-};
-
-}  // namespace app_list
-
-#endif  // UI_APP_LIST_PULSING_BLOCK_VIEW_H_