Log operator code histogram on new metric log

net/base/network_change_notifier.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.
 
 #ifndef NET_BASE_NETWORK_CHANGE_NOTIFIER_H_
 #define NET_BASE_NETWORK_CHANGE_NOTIFIER_H_
 
 #include "base/basictypes.h"
 #include "base/observer_list_threadsafe.h"
 #include "base/time/time.h"
@@ skipping 214 matching lines @@
   // Register the Observer callbacks for producing histogram data.  This
   // should be called from the network thread to avoid race conditions.
   // ShutdownHistogramWatcher() must be called prior to NetworkChangeNotifier
   // destruction.
   static void InitHistogramWatcher();
 
   // Unregister the Observer callbacks for producing histogram data.  This
   // should be called from the network thread to avoid race conditions.
   static void ShutdownHistogramWatcher();
 
+  // Log the |NCN.NetworkOperatorMCCMNC| histogram.
+  static void LogOperatorCodeHistogram(ConnectionType type);
+
   // Allows a second NetworkChangeNotifier to be created for unit testing, so
   // the test suite can create a MockNetworkChangeNotifier, but platform
   // specific NetworkChangeNotifiers can also be created for testing.  To use,
   // create an DisableForTest object, and then create the new
   // NetworkChangeNotifier object.  The NetworkChangeNotifier must be
   // destroyed before the DisableForTest object, as its destruction will restore
   // the original NetworkChangeNotifier.
   class NET_EXPORT DisableForTest {
    public:
     DisableForTest();
@@ skipping 75 matching lines @@
 
   // Computes NetworkChange signal from IPAddress and ConnectionType signals.
   scoped_ptr<NetworkChangeCalculator> network_change_calculator_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifier);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_NETWORK_CHANGE_NOTIFIER_H_