Adds the new URLRequest::OnBeforeNetworkStart hook to the

content/browser/loader/resource_handler.h

 // Copyright (c) 2012 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.
 
 // This is the browser side of the resource dispatcher, it receives requests
 // from the RenderProcessHosts, and dispatches them to URLRequests. It then
 // fowards the messages from the URLRequests back to the correct process for
 // handling.
 //
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
@@ skipping 55 matching lines @@
                                  bool* defer) = 0;
 
   // Called before the net::URLRequest for |request_id| (whose url is |url|) is
   // to be started.  If the handler returns false, then the request is
   // cancelled.  Otherwise if the return value is true, the ResourceHandler can
   // delay the request from starting by setting |*defer = true|.  A deferred
   // request will not have called net::URLRequest::Start(), and will not resume
   // until someone calls ResourceDispatcherHost::StartDeferredRequest().
   virtual bool OnWillStart(int request_id, const GURL& url, bool* defer) = 0;
 
+  // Called before the net::URLRequest for |request_id| (whose url is |url|}
+  // uses the network for the first time to load the resource. If the handler
+  // returns false, then the request is cancelled. Otherwise if the return value
+  // is true, the ResourceHandler can delay the request from starting by setting
+  // |*defer = true|. Call controller()->Resume() to continue if deferred.
+  virtual bool OnBeforeNetworkStart(int request_id,
+                                    const GURL& url,
+                                    bool* defer) = 0;
+
   // Data will be read for the response.  Upon success, this method places the
   // size and address of the buffer where the data is to be written in its
   // out-params.  This call will be followed by either OnReadCompleted or
   // OnResponseCompleted, at which point the buffer may be recycled.
   //
   // If the handler returns false, then the request is cancelled.  Otherwise,
   // once data is available, OnReadCompleted will be called.
   virtual bool OnWillRead(int request_id,
                           scoped_refptr<net::IOBuffer>* buf,
                           int* buf_size,
@@ skipping 32 matching lines @@
   ResourceMessageFilter* GetFilter() const;
 
  private:
   ResourceController* controller_;
   net::URLRequest* request_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_HANDLER_H_