Invalidate all wallpaper cache if display configuration changed

chrome/browser/chromeos/background/ash_user_wallpaper_delegate.cc

 // 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.
 
 #include "chrome/browser/chromeos/background/ash_user_wallpaper_delegate.h"
 
 #include "ash/shell.h"
 #include "ash/desktop_background/user_wallpaper_delegate.h"
 #include "ash/wm/window_animations.h"
 #include "base/command_line.h"
@@ skipping 65 matching lines @@
         HasSwitch(switches::kDisableBootAnimation);
     bool disable_oobe_animation = command_line->
         HasSwitch(switches::kDisableOobeAnimation);
     if ((!is_registered && disable_oobe_animation) ||
         (is_registered && disable_boot_animation))
       return false;
 
     return true;
   }
 
-  virtual void UpdateWallpaper() OVERRIDE {
-    chromeos::WallpaperManager::Get()->UpdateWallpaper();
+  virtual void UpdateWallpaper(bool clear_cache) OVERRIDE {
+    chromeos::WallpaperManager::Get()->UpdateWallpaper(clear_cache);
   }
 
   virtual void InitializeWallpaper() OVERRIDE {
     chromeos::WallpaperManager::Get()->InitializeWallpaper();
   }
 
   virtual void OpenSetWallpaperPage() OVERRIDE {
     wallpaper_manager_util::OpenWallpaperManager();
   }
 
@@ skipping 22 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(UserWallpaperDelegate);
 };
 
 }  // namespace
 
 ash::UserWallpaperDelegate* CreateUserWallpaperDelegate() {
   return new chromeos::UserWallpaperDelegate();
 }
 
 }  // namespace chromeos