Add field trial stats for alternate_protocol.

net/url_request/url_request.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_URL_REQUEST_URL_REQUEST_H_
 #define NET_URL_REQUEST_URL_REQUEST_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 353 matching lines @@
 
   // The time at which the returned response was generated.  For cached
   // responses, this is the last time the cache entry was validated.
   const base::Time& response_time() const {
     return response_info_.response_time;
   }
 
   // Indicate if this response was fetched from disk cache.
   bool was_cached() const { return response_info_.was_cached; }
 
-  // Returns true if the URLRequest was delivered with SPDY.
+  // True if response could use alternate protocol. However, browser will
+  // ingore the alternate protocol if spdy is not enabled.
   bool was_fetched_via_spdy() const {
     return response_info_.was_fetched_via_spdy;
   }
 
   // Returns true if the URLRequest was delivered after NPN is negotiated,
   // using either SPDY or HTTP.
   bool was_npn_negotiated() const {
     return response_info_.was_npn_negotiated;
   }
 
+  // Returns true if the URLRequest was delivered when the alertnate protocol
+  // is available.
+  bool was_alternate_protocol_available() const {
+    return response_info_.was_alternate_protocol_available;
+  }
+
   // Returns true if the URLRequest was delivered through a proxy.
   bool was_fetched_via_proxy() const {
     return response_info_.was_fetched_via_proxy;
   }
 
   // Get all response headers, as a HttpResponseHeaders object.  See comments
   // in HttpResponseHeaders class as to the format of the data.
   net::HttpResponseHeaders* response_headers() const;
 
   // Get the SSL connection info.
@@ skipping 237 matching lines @@
   // The priority level for this request.  Objects like ClientSocketPool use
   // this to determine which URLRequest to allocate sockets to first.
   net::RequestPriority priority_;
 
   base::LeakTracker<URLRequest> leak_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequest);
 };
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_H_