[Not for review] record detailed time breakdown of SW related requests.

content/public/common/resource_response_info.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_PUBLIC_COMMON_RESOURCE_RESPONSE_INFO_H_
 #define CONTENT_PUBLIC_COMMON_RESOURCE_RESPONSE_INFO_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 23 matching lines @@
   ~ResourceResponseInfo();
 
   // The time at which the request was made that resulted in this response.
   // For cached responses, this time could be "far" in the past.
   base::Time request_time;
 
   // The time at which the response headers were received.  For cached
   // responses, this time could be "far" in the past.
   base::Time response_time;
 
+  // TimeTicks::Now() when the browser sent the response to the renderer.
+  base::TimeTicks response_start;
+
   // The response headers or NULL if the URL type does not support headers.
   scoped_refptr<net::HttpResponseHeaders> headers;
 
   // The mime type of the response.  This may be a derived value.
   std::string mime_type;
 
   // The character encoding of the response or none if not applicable to the
   // response's mime type.  This may be a derived value.
   std::string charset;
 
@@ skipping 122 matching lines @@
   net::SignedCertificateTimestampAndStatusList signed_certificate_timestamps;
 
   // In case this is a CORS response fetched by a ServiceWorker, this is the
   // set of headers that should be exposed.
   std::vector<std::string> cors_exposed_header_names;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_RESOURCE_RESPONSE_INFO_H_