Invalidate all wallpaper cache if display configuration changed

chrome/browser/chromeos/extensions/wallpaper_private_api.cc

 // Copyright (c) 2013 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/extensions/wallpaper_private_api.h"
 
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "ash/desktop_background/desktop_background_controller.h"
@@ skipping 614 matching lines @@
     SendResponse(false);
     return false;
   }
   info.layout = wallpaper_api_util::GetLayoutEnum(
       wallpaper_private::ToString(params->layout));
 
   std::string email = chromeos::UserManager::Get()->GetActiveUser()->email();
   bool is_persistent =
       !chromeos::UserManager::Get()->IsCurrentUserNonCryptohomeDataEphemeral();
   wallpaper_manager->SetUserWallpaperInfo(email, info, is_persistent);
-  wallpaper_manager->UpdateWallpaper();
+  wallpaper_manager->UpdateWallpaper(false /* clear_cache */);
   SendResponse(true);
 
   // Gets email address while at UI thread.
   return true;
 }
 
 WallpaperPrivateMinimizeInactiveWindowsFunction::
     WallpaperPrivateMinimizeInactiveWindowsFunction() {
 }
 
@@ skipping 204 matching lines @@
                  this, file_list));
 }
 
 void WallpaperPrivateGetOfflineWallpaperListFunction::OnComplete(
     const std::vector<std::string>& file_list) {
   base::ListValue* results = new base::ListValue();
   results->AppendStrings(file_list);
   SetResult(results);
   SendResponse(true);
 }