Upload UMA data using protocol buffers.

chrome/browser/metrics/metrics_service.h

 // Copyright (c) 2012 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 defines a service that collects information about the user
 // experience in order to help improve future versions of the app.
 
 #ifndef CHROME_BROWSER_METRICS_METRICS_SERVICE_H_
 #define CHROME_BROWSER_METRICS_METRICS_SERVICE_H_
 #pragma once
@@ skipping 317 matching lines @@
   // Chrome OS hardware class (e.g., hardware qualification ID). This
   // class identifies the configured system components such as CPU,
   // WiFi adapter, etc.  For non Chrome OS hosts, this will be an
   // empty string.
   std::string hardware_class_;
 
   // The list of plugins which was retrieved on the file thread.
   std::vector<webkit::WebPluginInfo> plugins_;
 
   // The outstanding transmission appears as a URL Fetch operation.
-  scoped_ptr<content::URLFetcher> current_fetch_;
+  scoped_ptr<content::URLFetcher> current_fetch_xml_;
+  scoped_ptr<content::URLFetcher> current_fetch_proto_;
 
-  // The URL for the metrics server.
-  std::wstring server_url_;
+  // Cached responses from the XML request while we wait for a response to the
+  // protubuf request.
+  int response_code_;
+  std::string response_status_;
+  std::string response_data_;
+
+  // The URLs for the XML and protobuf metrics servers.
+  string16 server_url_xml_;
+  string16 server_url_proto_;
 
   // The TCP/UDP echo server to collect network connectivity stats.
   std::string network_stats_server_;
 
   // The IOThread for accessing global HostResolver to resolve
   // network_stats_server_ host. |io_thread_| is accessed on IO thread and it is
   // safe to access it on IO thread.
   IOThread* io_thread_;
 
   // The identifier that's sent to the server with the log reports.
@@ skipping 55 matching lines @@
   friend class InstantFieldTrial;
   friend bool prerender::IsOmniboxEnabled(Profile* profile);
 
   // Returns true if prefs::kMetricsReportingEnabled is set.
   static bool IsMetricsReportingEnabled();
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(MetricsServiceHelper);
 };
 
 #endif  // CHROME_BROWSER_METRICS_METRICS_SERVICE_H_