Introduce AppCacheResponseMetadataWriter to support metadata caching.

content/browser/appcache/mock_appcache_storage.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 "content/browser/appcache/mock_appcache_storage.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 147 matching lines @@
   if (simulated_reader_)
     return simulated_reader_.release();
   return new AppCacheResponseReader(response_id, group_id, disk_cache());
 }
 
 AppCacheResponseWriter* MockAppCacheStorage::CreateResponseWriter(
     const GURL& manifest_url, int64 group_id) {
   return new AppCacheResponseWriter(NewResponseId(),  group_id, disk_cache());
 }
 
+AppCacheResponseMetadataWriter*
+MockAppCacheStorage::CreateResponseMetadataWriter(int64 group_id,
+                                                  int64 response_id) {
+  return new AppCacheResponseMetadataWriter(response_id, group_id,
+                                            disk_cache());
+}
+
 void MockAppCacheStorage::DoomResponses(
     const GURL& manifest_url, const std::vector<int64>& response_ids) {
   DeleteResponses(manifest_url, response_ids);
 }
 
 void MockAppCacheStorage::DeleteResponses(
     const GURL& manifest_url, const std::vector<int64>& response_ids) {
   // We don't bother with actually removing responses from the disk-cache,
   // just keep track of which ids have been doomed or deleted
   std::vector<int64>::const_iterator it = response_ids.begin();
@@ skipping 357 matching lines @@
 bool MockAppCacheStorage::ShouldCacheLoadAppearAsync(const AppCache* cache) {
   if (!cache)
     return true;
 
   // If the 'stored' ref is the only ref, real storage will have to load from
   // the database.
   return IsCacheStored(cache) && cache->HasOneRef();
 }
 
 }  // namespace content