Adds the new URLRequest::OnBeforeNetworkStart hook to the

content/browser/loader/throttling_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.
 
 #ifndef CONTENT_BROWSER_LOADER_THROTTLING_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_LOADER_THROTTLING_RESOURCE_HANDLER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
 #include "content/browser/loader/layered_resource_handler.h"
@@ skipping 21 matching lines @@
 
   // LayeredResourceHandler overrides:
   virtual bool OnRequestRedirected(int request_id, const GURL& url,
                                    ResourceResponse* response,
                                    bool* defer) OVERRIDE;
   virtual bool OnResponseStarted(int request_id,
                                  ResourceResponse* response,
                                  bool* defer) OVERRIDE;
   virtual bool OnWillStart(int request_id, const GURL& url,
                            bool* defer) OVERRIDE;
+  virtual bool OnBeforeNetworkStart(int request_id,
+                                  const GURL& url,
+                                  bool* defer) OVERRIDE;
 
   // ResourceController implementation:
   virtual void Cancel() OVERRIDE;
   virtual void CancelAndIgnore() OVERRIDE;
   virtual void CancelWithError(int error_code) OVERRIDE;
   virtual void Resume() OVERRIDE;
 
  private:
   void ResumeStart();
+  void ResumeNetworkStart();
   void ResumeRedirect();
   void ResumeResponse();
 
   // Called when the throttle at |throttle_index| defers a request.  Logs the
   // name of the throttle that delayed the request.
   void OnRequestDefered(int throttle_index);
 
   enum DeferredStage {
     DEFERRED_NONE,
     DEFERRED_START,
+    DEFERRED_NETWORK_START,
     DEFERRED_REDIRECT,
     DEFERRED_RESPONSE
   };
   DeferredStage deferred_stage_;
 
   ScopedVector<ResourceThrottle> throttles_;
   size_t next_index_;
 
   GURL deferred_url_;
   scoped_refptr<ResourceResponse> deferred_response_;
 
   bool cancelled_by_resource_throttle_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_THROTTLING_RESOURCE_HANDLER_H_