Glue for sending/receiving cacheable metadata.

webkit/glue/resource_loader_bridge.h

Index: webkit/glue/resource_loader_bridge.h
===================================================================
--- webkit/glue/resource_loader_bridge.h	(revision 47287)
+++ webkit/glue/resource_loader_bridge.h	(working copy)
@@ -181,6 +181,10 @@
     // be called multiple times or not at all if an error occurs.
     virtual void OnReceivedData(const char* data, int len) = 0;
 
+    // Called when metadata generated by the renderer is retrieved from the
+    // cache. This method may be called zero or one times.
+    virtual void OnReceivedCachedMetadata(const char* data, int len) { }
+
     // Called when the response is complete.  This method signals completion of
     // the resource load.ff
     virtual void OnCompletedRequest(const URLRequestStatus& status,