Send fatal proxy errors to the network delegate.

net/http/http_network_delegate.h

 // Copyright (c) 2010 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 NET_HTTP_HTTP_NETWORK_DELEGATE_H_
 #define NET_HTTP_HTTP_NETWORK_DELEGATE_H_
 #pragma once
 
 namespace net {
 
 class HttpRequestHeaders;
 class URLRequest;
 
 class HttpNetworkDelegate {
  public:
   // Called before a request is sent.
   virtual void OnBeforeURLRequest(net::URLRequest* request) = 0;
 
   // Called right before the HTTP headers are sent.  Allows the delegate to
   // read/write |headers| before they get sent out.
   virtual void OnSendHttpRequest(HttpRequestHeaders* headers) = 0;
 
+  // Called right after the response started.
+  virtual void OnResponseStarted(net::URLRequest* request) = 0;
+
+  // Called when the Read of the response body is completed.

[willchan no longer on Chromium, 2011/02/21 23:35:39]

You should say this corresponds to URLRequest::Delegate::Read(). Otherwise, you
need to note here that bytes_read is -1 when an error occurs, and the
URLRequestStatus will be updated.

+  virtual void OnReadCompleted(net::URLRequest* request, int bytes_read) = 0;
+
  protected:
   virtual ~HttpNetworkDelegate() {}
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_DELEGATE_H_