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

webkit/appcache/appcache_backend_impl.cc

Index: webkit/appcache/appcache_backend_impl.cc
===================================================================
--- webkit/appcache/appcache_backend_impl.cc	(revision 80669)
+++ webkit/appcache/appcache_backend_impl.cc	(working copy)
@@ -59,8 +59,7 @@
   AppCacheHost* host = GetHost(host_id);
   if (!host)
     return false;
-  // TODO(michaeln): Write me, see the bug for details.
-  // http://code.google.com/p/chromium/issues/detail?id=68479
+  host->SetSpawningHostId(process_id_, spawning_host_id);
   return true;
 }