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

chrome/browser/ui/ash/launcher/chrome_launcher_controller.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 CHROME_BROWSER_UI_ASH_LAUNCHER_CHROME_LAUNCHER_CONTROLLER_H_
 #define CHROME_BROWSER_UI_ASH_LAUNCHER_CHROME_LAUNCHER_CONTROLLER_H_
 
 #include <list>
 #include <map>
 #include <string>
@@ skipping 74 matching lines @@
 
   // Interface used to load app icons. This is in it's own class so that it can
   // be mocked.
   class AppIconLoader {
    public:
     virtual ~AppIconLoader() {}
 
     // Fetches the image for the specified id. When done (which may be
     // synchronous), this should invoke SetAppImage() on the LauncherUpdater.
     virtual void FetchImage(const std::string& id) = 0;
+
+    // Clears the image for the specified id.
+    virtual void ClearImage(const std::string& id) = 0;
   };
 
   ChromeLauncherController(Profile* profile, ash::LauncherModel* model);
   virtual ~ChromeLauncherController();
 
   // Initializes this ChromeLauncherController.
   void Init();
 
   // Returns the single ChromeLauncherController instnace.
   static ChromeLauncherController* instance() { return instance_; }
@@ skipping 245 matching lines @@
 
   PrefChangeRegistrar pref_change_registrar_;
 
   ProfileSyncService* observed_sync_service_;
   base::OneShotTimer<ChromeLauncherController> loading_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeLauncherController);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_LAUNCHER_CHROME_LAUNCHER_CONTROLLER_H_