Record Mobile Operator ID in UMA report. This is Android only for now.

net/base/network_change_notifier.cc

 // 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.
 
 #include "net/base/network_change_notifier.h"
 
 #include "base/metrics/histogram.h"
+#include "base/metrics/sparse_histogram.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
 #include "build/build_config.h"
 #include "net/base/net_util.h"
 #include "net/base/network_change_notifier_factory.h"
 #include "net/dns/dns_config_service.h"
 #include "net/url_request/url_request.h"
 #include "url/gurl.h"
 
+#if defined(OS_ANDROID)
+#include "net/android/network_library.h"
+#endif
+
 #if defined(OS_WIN)
 #include "net/base/network_change_notifier_win.h"
 #elif defined(OS_LINUX) && !defined(OS_CHROMEOS)
 #include "net/base/network_change_notifier_linux.h"
 #elif defined(OS_MACOSX)
 #include "net/base/network_change_notifier_mac.h"
 #endif
 
 namespace net {
 
@@ skipping 219 matching lines @@
                                SinceLast(&last_dns_change_));
   }
 
   // NetworkChangeNotifier::NetworkChangeObserver implementation.
   virtual void OnNetworkChanged(
       NetworkChangeNotifier::ConnectionType type) OVERRIDE {
     DCHECK(thread_checker_.CalledOnValidThread());
     if (type != NetworkChangeNotifier::CONNECTION_NONE) {
       UMA_HISTOGRAM_MEDIUM_TIMES("NCN.NetworkOnlineChange",
                                  SinceLast(&last_network_change_));
+#if defined(OS_ANDROID)
+      std::string mcc_mnc = android::GetTelephonyNetworkOperator();
+      // MCC and MNC codes are each 3 digits.

[Ilya Sherman, 2014/04/26 02:29:12]

From scanning the Wikipedia article, it looked like MCC was always 3 digits, but
MNC could be anywhere between 1 and 3 digits.  Is the length being normalized
internally to android::GetTelephonyNetworkOperator()?

[bolian, 2014/04/28 18:07:55]

My bad. Now, I think I should only check the return is not empty.

+      if (mcc_mnc.length() == 6) {
+        int value = atoi(mcc_mnc.c_str());
+        if (value> 0) {
+          UMA_HISTOGRAM_SPARSE_SLOWLY("NCN.NetworkOperatorMCCMNC", value);
+        }
+      }
+#endif
+
     } else {
       UMA_HISTOGRAM_MEDIUM_TIMES("NCN.NetworkOfflineChange",
                                  SinceLast(&last_network_change_));
     }
   }
 
   // Record histogram data whenever we receive a packet. Should only be called
   // from the network thread.
   void NotifyDataReceived(const URLRequest& request, int bytes_read) {
     DCHECK(thread_checker_.CalledOnValidThread());
@@ skipping 476 matching lines @@
   DCHECK(g_network_change_notifier);
   g_network_change_notifier = NULL;
 }
 
 NetworkChangeNotifier::DisableForTest::~DisableForTest() {
   DCHECK(!g_network_change_notifier);
   g_network_change_notifier = network_change_notifier_;
 }
 
 }  // namespace net