Add DataReductionProxy IPC to determine if the Data Reduction Proxy was used.

content/public/renderer/document_state.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_PUBLIC_RENDERER_DOCUMENT_STATE_H_
 #define CONTENT_PUBLIC_RENDERER_DOCUMENT_STATE_H_
 
 #include <string>
 
 #include "base/logging.h"
@@ skipping 143 matching lines @@
   void set_connection_info(
       net::HttpResponseInfo::ConnectionInfo connection_info) {
     connection_info_ = connection_info;
   }
 
   bool was_fetched_via_proxy() const { return was_fetched_via_proxy_; }
   void set_was_fetched_via_proxy(bool value) {
     was_fetched_via_proxy_ = value;
   }
 
-  net::HostPortPair proxy_server() const { return proxy_server_; }
-  void set_proxy_server(net::HostPortPair proxy_server) {
+  const net::HostPortPair& proxy_server() const { return proxy_server_; }
+  void set_proxy_server(const net::HostPortPair& proxy_server) {

[Charlie Reis, 2015/02/27 23:35:31]

I don't think you want to make this change on the setter.  Callers may not keep
the original proxy_server alive as long as this object.

[jeremyim, 2015/02/27 23:37:42]

Wouldn't we call the copy constructor, since it's stored locally?

[Charlie Reis, 2015/02/27 23:58:39]

Most classes in Chrome have DISALLOW_COPY_AND_ASSIGN.  It looks like you're
right in the HostPortPair case, though, so this should work.

     proxy_server_ = proxy_server;
   }
 
   void set_was_prefetcher(bool value) { was_prefetcher_ = value; }
   bool was_prefetcher() const { return was_prefetcher_; }
 
   void set_was_referred_by_prefetcher(bool value) {
     was_referred_by_prefetcher_ = value;
   }
   bool was_referred_by_prefetcher() const {
@@ skipping 43 matching lines @@
   LoadType load_type_;
 
   scoped_ptr<NavigationState> navigation_state_;
 
   bool can_load_local_resources_;
 };
 
 #endif  // CONTENT_PUBLIC_RENDERER_DOCUMENT_STATE_H_
 
 }  // namespace content