Select a more appropiate appcache based on the opener or the parent of the new document.

webkit/appcache/appcache_storage_impl.h

Index: webkit/appcache/appcache_storage_impl.h
===================================================================
--- webkit/appcache/appcache_storage_impl.h	(revision 81647)
+++ webkit/appcache/appcache_storage_impl.h	(working copy)
@@ -35,7 +35,8 @@
   virtual void LoadOrCreateGroup(const GURL& manifest_url, Delegate* delegate);
   virtual void StoreGroupAndNewestCache(
       AppCacheGroup* group, AppCache* newest_cache, Delegate* delegate);
-  virtual void FindResponseForMainRequest(const GURL& url, Delegate* delegate);
+  virtual void FindResponseForMainRequest(
+      const GURL& url, const GURL& preferred_manifest_url, Delegate* delegate);
   virtual void FindResponseForSubRequest(
       AppCache* cache, const GURL& url,
       AppCacheEntry* found_entry, AppCacheEntry* found_fallback_entry,
@@ -101,6 +102,8 @@
   void OnDiskCacheInitialized(int rv);
 
   // Sometimes we can respond without having to query the database.
+  bool FindResponseForMainRequestInGroup(
+      AppCacheGroup* group,  const GURL& url, Delegate* delegate);
   void DeliverShortCircuitedFindMainResponse(
       const GURL& url, AppCacheEntry found_entry,
       scoped_refptr<AppCacheGroup> group, scoped_refptr<AppCache> newest_cache,