Glue for sending/receiving cacheable metadata.

webkit/glue/resource_loader_bridge.h

 // Copyright (c) 2006-2008 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.
 //
 // The intent of this file is to provide a type-neutral abstraction between
 // Chrome and WebKit for resource loading. This pure-virtual interface is
 // implemented by the embedder, which also provides a factory method Create
 // to instantiate this object.
 //
 // One of these objects will be created by WebKit for each request. WebKit
@@ skipping 163 matching lines @@
     // been followed).  |content_filtered| is set to true if the contents is
     // altered or replaced (usually for security reasons when the resource is
     // deemed unsafe).
     virtual void OnReceivedResponse(const ResponseInfo& info,
                                     bool content_filtered) = 0;
 
     // Called when a chunk of response data is available. This method may
     // 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,
                                     const std::string& security_info) = 0;
 
     // Returns the URL of the request, which allows us to display it in
     // debugging situations.
     virtual GURL GetURLForDebugging() const = 0;
   };
 
@@ skipping 57 matching lines @@
   // construction must go through Create()
   ResourceLoaderBridge();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ResourceLoaderBridge);
 };
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_GLUE_RESOURCE_LOADER_BRIDGE_H_