Collect stats to investigate the viability of UDP

chrome/browser/metrics/metrics_service.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 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
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
+#include "chrome/browser/io_thread.h"
 #include "chrome/common/metrics_helpers.h"
 #include "content/common/notification_observer.h"
 #include "content/common/notification_registrar.h"
 #include "content/common/url_fetcher.h"
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/external_metrics.h"
 #endif
 
 class BookmarkModel;
@@ skipping 324 matching lines @@
 
   // The list of plugins which was retrieved on the file thread.
   std::vector<webkit::npapi::WebPluginInfo> plugins_;
 
   // The outstanding transmission appears as a URL Fetch operation.
   scoped_ptr<URLFetcher> current_fetch_;
 
   // The URL for the metrics server.
   std::wstring server_url_;
 
+  // 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.

[willchan no longer on Chromium, 2011/06/08 14:07:02]

Maybe you should document that this is only safe to access on the IO thread?

[ramant (doing other things), 2011/06/08 17:47:17]

Done.

+  IOThread* io_thread_;
+
   // The identifier that's sent to the server with the log reports.
   std::string client_id_;
 
   // Whether the MetricsService object has received any notifications since
   // the last time a transmission was sent.
   bool idle_since_last_transmission_;
 
   // A number that identifies the how many times the app has been launched.
   int session_id_;
 
@@ skipping 46 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, CorruptSizeOfLogList);
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, CorruptChecksumOfLogList);
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, ClientIdGeneratesAllZeroes);
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, ClientIdGeneratesCorrectly);
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, ClientIdCorrectlyFormatted);
 
   DISALLOW_COPY_AND_ASSIGN(MetricsService);
 };
 
 #endif  // CHROME_BROWSER_METRICS_METRICS_SERVICE_H_