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

net/base/network_change_notifier.cc

Index: net/base/network_change_notifier.cc
diff --git a/net/base/network_change_notifier.cc b/net/base/network_change_notifier.cc
index 638964a25d29ad12016b9d20ad64cf82df7ef222..0a0fa4c28efb350a8b081e380073fb4b8338dfed 100644
--- a/net/base/network_change_notifier.cc
+++ b/net/base/network_change_notifier.cc
@@ -5,6 +5,7 @@
 #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"
@@ -14,6 +15,10 @@
 #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)
@@ -253,6 +258,17 @@ class HistogramWatcher
     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_));