arc: Prevent overwriting of the Chrome Play Store icon.

chrome/browser/ui/app_list/arc/arc_app_icon.h

 // Copyright 2015 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 CHROME_BROWSER_UI_APP_LIST_ARC_ARC_APP_ICON_H_
 #define CHROME_BROWSER_UI_APP_LIST_ARC_ARC_APP_ICON_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 27 matching lines @@
     virtual ~Observer() {}
   };
 
   ArcAppIcon(content::BrowserContext* context,
              const std::string& app_id,
              int resource_size_in_dip,
              Observer* observer);
   ~ArcAppIcon();
 
   const std::string& app_id() const { return app_id_; }
-  gfx::Image image() const { return image_; }
   const gfx::ImageSkia& image_skia() const { return image_skia_; }
 
-  // Icon loading is performed in several steps. It is initiated by
-  // LoadImageForScaleFactor request that specifies a required scale factor.
-  // ArcAppListPrefs is used to resolve a path to resource. Content of file is
-  // asynchronously read in context of browser file thread. On successful read,
-  // an icon data is decoded to an image in the special utility process.
-  // DecodeRequest is used to interact with the utility process, and each
-  // active request is stored at |decode_requests_| vector. When decoding is
-  // complete, results are returned in context of UI thread, and corresponding
-  // request is removed from |decode_requests_|. In case of some requests are
-  // not completed by the time of deleting this icon, they are automatically
-  // canceled.
-  // In case of the icon file is not available this requests ArcAppListPrefs to
-  // install required resource from ARC side. ArcAppListPrefs notifies UI items
-  // that new icon is available and corresponding item should invoke
-  // LoadImageForScaleFactor again.
-  void LoadForScaleFactor(ui::ScaleFactor scale_factor);
-
   // Disables async safe decoding requests when unit tests are executed. This is
   // done to avoid two problems. Problems come because icons are decoded at a
   // separate process created by ImageDecoder. ImageDecoder has 5 seconds delay
   // to stop since the last request (see its kBatchModeTimeoutSeconds for more
   // details). This is unacceptably long for unit tests because the test
   // framework waits until external process is finished. Another problem happens
   // when we issue a decoding request, but the process has not started its
   // processing yet by the time when a test exits. This might cause situation
   // when g_one_utility_thread_lock from in_process_utility_thread.cc gets
   // released in an acquired state which is crash condition in debug builds.
   static void DisableSafeDecodingForTesting();
 
  private:
+  friend class ArcAppIconLoader;
+  friend class ArcAppModelBuilder;
+
   class Source;
   class DecodeRequest;
   struct ReadResult;
 
+  // Icon loading is performed in several steps. It is initiated by
+  // LoadImageForScaleFactor request that specifies a required scale factor.
+  // ArcAppListPrefs is used to resolve a path to resource. Content of file is
+  // asynchronously read in context of browser file thread. On successful read,
+  // an icon data is decoded to an image in the special utility process.
+  // DecodeRequest is used to interact with the utility process, and each
+  // active request is stored at |decode_requests_| vector. When decoding is
+  // complete, results are returned in context of UI thread, and corresponding
+  // request is removed from |decode_requests_|. In case of some requests are
+  // not completed by the time of deleting this icon, they are automatically
+  // canceled.
+  // In case of the icon file is not available this requests ArcAppListPrefs to
+  // install required resource from ARC side. ArcAppListPrefs notifies UI items
+  // that new icon is available and corresponding item should invoke
+  // LoadImageForScaleFactor again.
+  void LoadForScaleFactor(ui::ScaleFactor scale_factor);
+
   void MaybeRequestIcon(ui::ScaleFactor scale_factor);
   static std::unique_ptr<ArcAppIcon::ReadResult> ReadOnFileThread(
       ui::ScaleFactor scale_factor,
       const base::FilePath& path,
       const base::FilePath& default_app_path);
   void OnIconRead(std::unique_ptr<ArcAppIcon::ReadResult> read_result);
   void Update(const gfx::ImageSkia* image);
   void DiscardDecodeRequest(DecodeRequest* request);
 
   content::BrowserContext* context_;
   std::string app_id_;
   const int resource_size_in_dip_;
   Observer* observer_;
 
   Source* source_ = nullptr;  // Owned by ImageSkia storage.
   gfx::ImageSkia image_skia_;
 
-  // The image wrapper around |image_skia_|.
-  // Note: this is reset each time a new representation is loaded.
-  gfx::Image image_;
-
   // Contains pending image decode requests.
   std::vector<std::unique_ptr<DecodeRequest>> decode_requests_;
 
   base::WeakPtrFactory<ArcAppIcon> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcAppIcon);
 };
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_ARC_ARC_APP_ICON_H_