If user had consented for metrics reporting, send speech input request origin to the server.

chrome/common/net/url_fetcher.h

 // Copyright (c) 2011 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.
 //
 // This file contains URLFetcher, a wrapper around net::URLRequest that handles
 // low-level details like thread safety, ref counting, and incremental buffer
 // reading.  This is useful for callers who simply want to get the data from a
 // URL and don't care about all the nitty-gritty details.
 //
 // NOTE(willchan): Only one "IO" thread is supported for URLFetcher.  This is a
@@ skipping 121 matching lines @@
   void set_upload_data(const std::string& upload_content_type,
                        const std::string& upload_content);
 
   // Set one or more load flags as defined in net/base/load_flags.h.  Must be
   // called before the request is started.
   void set_load_flags(int load_flags);
 
   // Returns the current load flags.
   int load_flags() const;
 
+  // The referrer URL for the request, to be set before Start() is called.

[wtc, 2011/01/19 22:22:02]

Nit: I suggest you copy the same sentence
    Must be called before the request is started.
that's used in other setters (line 136, line 145, line
149, etc.).

[Satish, 2011/01/20 11:04:12]

Done.

+  void set_referrer(const std::string& referrer);
+
   // Set extra headers on the request.  Must be called before the request
   // is started.
   void set_extra_request_headers(const std::string& extra_request_headers);
 
   // Set the net::URLRequestContext on the request.  Must be called before the
   // request is started.
   void set_request_context(
       URLRequestContextGetter* request_context_getter);
 
   // If |retry| is false, 5xx responses will be propagated to the observer,
@@ skipping 61 matching lines @@
   base::TimeDelta backoff_delay_;
   // Maximum retries allowed.
   int max_retries_;
 
   static bool g_interception_enabled;
 
   DISALLOW_COPY_AND_ASSIGN(URLFetcher);
 };
 
 #endif  // CHROME_COMMON_NET_URL_FETCHER_H_