chromeos: Fix pixelated icons in app list and launcher (part 3)

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