Add header pointer to BeforeProxyHeadersSentCallback

net/http/http_transaction.h

 // Copyright (c) 2011 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_TRANSACTION_H_
 #define NET_HTTP_HTTP_TRANSACTION_H_
 
 #include "net/base/completion_callback.h"
 #include "net/base/load_states.h"
 #include "net/base/net_export.h"
@@ skipping 18 matching lines @@
 // HTTP redirects are not followed and authentication challenges are not
 // answered.  Cookies are assumed to be managed by the caller.
 class NET_EXPORT_PRIVATE HttpTransaction {
  public:
   // If |*defer| is set to true, the transaction will wait until
   // ResumeNetworkStart is called before establishing a connection.
   typedef base::Callback<void(bool* defer)> BeforeNetworkStartCallback;
 
   // Provides an opportunity to add proxy-specific request headers. Called after
   // it is determined that a proxy is being used and before the request headers
-  // are sent. |proxy_info| contains information about the proxy being used.
+  // are sent. |proxy_info| contains information about the proxy being used,
+  // and additional headers may be added to |request_headers|.
   typedef base::Callback<void(
-      const ProxyInfo& proxy_info)> BeforeProxyHeadersSentCallback;
+      const ProxyInfo& proxy_info,
+      HttpRequestHeaders* request_headers)> BeforeProxyHeadersSentCallback;
 
   // Stops any pending IO and destroys the transaction object.
   virtual ~HttpTransaction() {}
 
   // Starts the HTTP transaction (i.e., sends the HTTP request).
   //
   // Returns OK if the transaction could be started synchronously, which means
   // that the request was served from the cache.  ERR_IO_PENDING is returned to
   // indicate that the CompletionCallback will be notified once response info is
   // available or if an IO error occurs.  Any other return value indicates that
@@ skipping 118 matching lines @@
   virtual void SetBeforeProxyHeadersSentCallback(
       const BeforeProxyHeadersSentCallback& callback) = 0;
 
   // Resumes the transaction after being deferred.
   virtual int ResumeNetworkStart() = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_TRANSACTION_H_