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

webkit/appcache/appcache_host.h

Index: webkit/appcache/appcache_host.h
===================================================================
--- webkit/appcache/appcache_host.h	(revision 80669)
+++ webkit/appcache/appcache_host.h	(working copy)
@@ -71,6 +71,16 @@
   void SwapCacheWithCallback(SwapCacheCallback* callback,
                              void* callback_param);
 
+  // Called prior to the main resource load. When the system contains multiple
+  // candidates for a main resource load, the appcache preferred by the host
+  //  that created this host is used to break ties.

[jennb, 2011/04/12 00:07:56]

indentation

[michaeln, 2011/04/14 23:41:23]

Done.

+  void SetSpawningHostId(int spawning_process_id, int spawning_host_id);
+  AppCacheHost* GetSpawningHost();

[adamk, 2011/04/11 20:45:16]

Can this be a const AppChacheHost*?  I think you should have a comment for this
method noting under what conditions it returns NULL.

+  const GURL& preferred_manifest_url() { return preferred_manifest_url_; }

[adamk, 2011/04/11 20:45:16]

You can make this a const method.

[michaeln, 2011/04/14 23:41:23]

Done.

+  void set_preferred_manifest_url(const GURL& url) {
+    preferred_manifest_url_ = url;
+  }
+
   // Support for loading resources out of the appcache.
   // May return NULL if the request isn't subject to retrieval from an appache.
   AppCacheRequestHandler* CreateRequestHandler(
@@ -149,6 +159,13 @@
   // Identifies the corresponding appcache host in the child process.
   int host_id_;
 
+  // Information about the host that created this one, the manifest

[jennb, 2011/04/12 00:07:56]

nit: replace comma with semicolon

[michaeln, 2011/04/14 23:41:23]

Done.

+  // preferred by our creator influences which cache our main resource
+  // should be loaded from.
+  int spawning_host_id_;
+  int spawning_process_id_;
+  GURL preferred_manifest_url_;
+
   // Hosts for dedicated workers are special cased to shunt
   // request handling off to the dedicated worker's parent.
   // The scriptable api is not accessible in dedicated workers