Add field trial stats for alternate_protocol.

webkit/glue/resource_loader_bridge.h

 // Copyright (c) 2006-2008 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.
 //
 // The intent of this file is to provide a type-neutral abstraction between
 // Chrome and WebKit for resource loading. This pure-virtual interface is
 // implemented by the embedder, which also provides a factory method Create
 // to instantiate this object.
 //
 // One of these objects will be created by WebKit for each request. WebKit
@@ skipping 110 matching lines @@
     // The manifest url of the appcache this response was loaded from.
     // Note: this value is only populated for main resource requests.
     GURL appcache_manifest_url;
 
     // True if the response was delivered using SPDY.
     bool was_fetched_via_spdy;
 
     // True if the response was delivered after NPN is negotiated.
     bool was_npn_negotiated;
 
+    // True if response could use alternate protocol. However, browser will
+    // ignore the alternate protocol when spdy is not enabled on browser side.
+    bool was_alternate_protocol_available;
+
     // True if the response was fetched via an explicit proxy (as opposed to a
     // transparent proxy). The proxy could be any type of proxy, HTTP or SOCKS.
     // Note: we cannot tell if a transparent proxy may have been involved.
     bool was_fetched_via_proxy;
   };
 
   // See the SyncLoad method declared below.  (The name of this struct is not
   // suffixed with "Info" because it also contains the response data.)
   struct SyncLoadResponse : ResponseInfo {
     SyncLoadResponse();
@@ skipping 122 matching lines @@
   // construction must go through Create()
   ResourceLoaderBridge();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ResourceLoaderBridge);
 };
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_GLUE_RESOURCE_LOADER_BRIDGE_H_