Make the proxy server HostPortPair available in document_state so that

content/child/weburlresponse_extradata_impl.h

 // Copyright 2014 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_CHILD_WEBURLRESPONSE_EXTRADATA_IMPL_H_
 #define CONTENT_CHILD_WEBURLRESPONSE_EXTRADATA_IMPL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 17 matching lines @@
 
   // Flag whether this request was loaded via an explicit proxy
   // (HTTP, SOCKS, etc).
   bool was_fetched_via_proxy() const {
     return was_fetched_via_proxy_;
   }
   void set_was_fetched_via_proxy(bool was_fetched_via_proxy) {
     was_fetched_via_proxy_ = was_fetched_via_proxy;
   }
 
+  // The proxy server used if this request was loaded via an explicit proxy
+  // (HTTP, SOCKS, etc).
+  net::HostPortPair proxy_server() const {
+    return proxy_server_;
+  }
+  void set_proxy_server(net::HostPortPair proxy_server) {
+    proxy_server_ = proxy_server;
+  }
+
   /// Flag whether this request was loaded via the SPDY protocol or not.
   // SPDY is an experimental web protocol, see http://dev.chromium.org/spdy
   bool was_fetched_via_spdy() const {
     return was_fetched_via_spdy_;
   }
   void set_was_fetched_via_spdy(bool was_fetched_via_spdy) {
     was_fetched_via_spdy_ = was_fetched_via_spdy;
   }
 
   // Information about the type of connection used to fetch this response.
@@ skipping 27 matching lines @@
 
   bool is_ftp_directory_listing() const { return is_ftp_directory_listing_; }
   void set_is_ftp_directory_listing(bool is_ftp_directory_listing) {
     is_ftp_directory_listing_ = is_ftp_directory_listing;
   }
 
  private:
   std::string npn_negotiated_protocol_;
   bool is_ftp_directory_listing_;
   bool was_fetched_via_proxy_;
+  net::HostPortPair proxy_server_;
   bool was_fetched_via_spdy_;
   bool was_npn_negotiated_;
   net::HttpResponseInfo::ConnectionInfo connection_info_;
   bool was_alternate_protocol_available_;
 
   DISALLOW_COPY_AND_ASSIGN(WebURLResponseExtraDataImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBURLRESPONSE_EXTRADATA_IMPL_H_