Measure browser->render->browser hop time in UMA.

content/browser/loader/async_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_ASYNC_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_LOADER_ASYNC_RESOURCE_HANDLER_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
+#include "base/time/time.h"
 #include "content/browser/loader/resource_handler.h"
 #include "content/browser/loader/resource_message_delegate.h"
 #include "url/gurl.h"
 
 namespace net {
 class URLRequest;
 }
 
 namespace content {
 class ResourceBuffer;
@@ skipping 50 matching lines @@
   int allocation_size_;
 
   bool did_defer_;
 
   bool has_checked_for_sufficient_resources_;
   bool sent_received_response_msg_;
   bool sent_first_data_msg_;
 
   int64_t reported_transfer_size_;
 
+  base::TimeTicks redirect_start_time_;
+
   DISALLOW_COPY_AND_ASSIGN(AsyncResourceHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_ASYNC_RESOURCE_HANDLER_H_