Move app list from ash to ui.

ash/app_list/icon_cache.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 ASH_APP_LIST_ICON_CACHE_H_
-#define ASH_APP_LIST_ICON_CACHE_H_
-#pragma once
-
-#include <map>
-#include <string>
-
-#include "base/basictypes.h"
-#include "third_party/skia/include/core/SkBitmap.h"
-
-namespace gfx {
-class Size;
-}
-
-namespace ash {
-
-// IconCache stores processed image, keyed by the source image and desired size.
-class IconCache {
- public:
-  static void CreateInstance();
-  static void DeleteInstance();
-
-  static IconCache* GetInstance();
-
-  void MarkAllEntryUnused();
-  void PurgeAllUnused();
-
-  bool Get(const SkBitmap& src,
-           const gfx::Size& size,
-           SkBitmap* processed);
-  void Put(const SkBitmap& src,
-           const gfx::Size& size,
-           const SkBitmap& processed);
-
- private:
-  struct Item {
-    SkBitmap image;
-    bool used;
-  };
-  typedef std::map<std::string, Item> Cache;
-
-  IconCache();
-  ~IconCache();
-
-  static IconCache* instance_;
-
-  Cache cache_;
-
-  DISALLOW_COPY_AND_ASSIGN(IconCache);
-};
-
-}  // namespace ash
-
-#endif  // ASH_APP_LIST_ICON_CACHE_H_