Get main frame and subframe AppCache loads to work.

content/browser/appcache/appcache_storage.h

 // 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.
 
 #ifndef CONTENT_BROWSER_APPCACHE_APPCACHE_STORAGE_H_
 #define CONTENT_BROWSER_APPCACHE_APPCACHE_STORAGE_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 176 matching lines @@
   // persistently such that the responses will be deleted upon restart
   // if they aren't deleted prior to shutdown.
   virtual void DoomResponses(const GURL& manifest_url,
                              const std::vector<int64_t>& response_ids) = 0;
 
   // Schedules the lazy deletion of responses without persistently saving
   // the response ids.
   virtual void DeleteResponses(const GURL& manifest_url,
                                const std::vector<int64_t>& response_ids) = 0;
 
+  // Returns true if the AppCacheStorage instance is initialized.
+  virtual bool IsInitialized() = 0;
+
   // Generates unique storage ids for different object types.
   int64_t NewCacheId() { return ++last_cache_id_; }
   int64_t NewGroupId() { return ++last_group_id_; }
 
   // The working set of object instances currently in memory.
   AppCacheWorkingSet* working_set() { return &working_set_; }
 
   // A map of origins to usage.
   const UsageMap* usage_map() { return &usage_map_; }
 
@@ skipping 118 matching lines @@
 
   FRIEND_TEST_ALL_PREFIXES(content::AppCacheStorageTest, DelegateReferences);
   FRIEND_TEST_ALL_PREFIXES(content::AppCacheStorageTest, UsageMap);
 
   DISALLOW_COPY_AND_ASSIGN(AppCacheStorage);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_STORAGE_H_