Add field trial stats for alternate_protocol.

net/http/http_response_info.h

 // Copyright (c) 2006-2009 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_RESPONSE_INFO_H_
 #define NET_HTTP_HTTP_RESPONSE_INFO_H_
 
 #include "base/time.h"
 #include "net/base/auth.h"
 #include "net/base/io_buffer.h"
@@ skipping 20 matching lines @@
   // when a user presses the back button to re-render pages, or at startup,
   // when reloading previously visited pages (without going over the network).
   bool was_cached;
 
   // True if the request was fetched over a SPDY channel.
   bool was_fetched_via_spdy;
 
   // True if the npn was negotiated for this request.
   bool was_npn_negotiated;
 
+  // True if response could use alternate protocol. However, browser
+  // will ingore the alternate protocol if spdy is not enabled.
+  bool was_alternate_protocol_available;
+
   // True if the request was fetched via an explicit proxy.  The proxy could
   // be any type of proxy, HTTP or SOCKS.  Note, we do not know if a
   // transparent proxy may have been involved.
   bool was_fetched_via_proxy;
 
   // The time at which the request was made that resulted in this response.
   // For cached responses, this is the last time the cache entry was validated.
   base::Time request_time;
 
   // The time at which the response headers were received.  For cached
@@ skipping 27 matching lines @@
 
   // Call this method to persist the response info.
   void Persist(Pickle* pickle,
                bool skip_transient_headers,
                bool response_truncated) const;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_RESPONSE_INFO_H_