Decode ImageManager cached images on demand.

chrome/browser/search/suggestions/suggestions_service_factory.cc

 // Copyright 2014 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/search/suggestions/suggestions_service_factory.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 49 matching lines @@
 
   scoped_ptr<leveldb_proto::ProtoDatabaseImpl<ImageData> > db(
       new leveldb_proto::ProtoDatabaseImpl<ImageData>(background_task_runner));
 
   base::FilePath database_dir(
       the_profile->GetPath().Append(FILE_PATH_LITERAL("Thumbnails")));
 
   scoped_ptr<ImageFetcherImpl> image_fetcher(
       new ImageFetcherImpl(the_profile->GetRequestContext()));
   scoped_ptr<ImageManager> thumbnail_manager(
-      new ImageManager(image_fetcher.Pass(), db.Pass(), database_dir));
+      new ImageManager(
+          image_fetcher.Pass(), db.Pass(), database_dir,
+          BrowserThread::GetMessageLoopProxyForThread(BrowserThread::DB)));
   return new SuggestionsService(
       the_profile->GetRequestContext(), suggestions_store.Pass(),
       thumbnail_manager.Pass(), blacklist_store.Pass());
 }
 
 void SuggestionsServiceFactory::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   SuggestionsService::RegisterProfilePrefs(registry);
 }
 
 }  // namespace suggestions