AppCache: Use a dedicated thread for the disk cache.

chrome/browser/appcache/chrome_appcache_service.cc

 // Copyright (c) 2010 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/appcache/chrome_appcache_service.h"
 
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/cookie_prompt_modal_dialog_delegate.h"
@@ skipping 35 matching lines @@
 // ----------------------------------------------------------------------------
 
 ChromeAppCacheService::ChromeAppCacheService(
     const FilePath& profile_path,
     ChromeURLRequestContext* request_context) {
   DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
   DCHECK(request_context);
 
   if (!has_initialized_thread_ids) {
     has_initialized_thread_ids = true;
-    appcache::AppCacheThread::Init(ChromeThread::DB, ChromeThread::IO,
-                                   NULL);  // TODO(michaeln): cache_thread
+    appcache::AppCacheThread::Init(ChromeThread::DB, ChromeThread::IO);
   }
 
   host_contents_settings_map_ = request_context->host_content_settings_map();
   registrar_.Add(
       this, NotificationType::PURGE_MEMORY, NotificationService::AllSources());
 
   // Init our base class.
   Initialize(request_context->is_off_the_record() ?
-      FilePath() : profile_path.Append(chrome::kAppCacheDirname));
+                 FilePath() : profile_path.Append(chrome::kAppCacheDirname),
+             ChromeThread::GetMessageLoopProxyForThread(ChromeThread::CACHE));
   set_request_context(request_context);
   set_appcache_policy(this);
 }
 
 ChromeAppCacheService::~ChromeAppCacheService() {
   DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
 }
 
 // static
 void ChromeAppCacheService::ClearLocalState(const FilePath& profile_path) {
@@ skipping 92 matching lines @@
     const tracked_objects::Location& from_here,
     Task* task) {
   return ChromeThread::PostTask(ToChromeThreadID(id), from_here, task);
 }
 
 bool AppCacheThread::CurrentlyOn(int id) {
   return ChromeThread::CurrentlyOn(ToChromeThreadID(id));
 }
 
 }  // namespace appcache