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

chrome/browser/metrics/metrics_log.cc

Index: chrome/browser/metrics/metrics_log.cc
diff --git a/chrome/browser/metrics/metrics_log.cc b/chrome/browser/metrics/metrics_log.cc
index 239657f11ec79747a346e6327789f21d743eeae2..61dc32e93f9cc3f27ce1a92f96cf2c3d42b66436 100644
--- a/chrome/browser/metrics/metrics_log.cc
+++ b/chrome/browser/metrics/metrics_log.cc
@@ -707,6 +707,13 @@ void MetricsLog::RecordEnvironment(
       network_observer_.wifi_phy_layer_protocol_is_ambiguous());
   network->set_wifi_phy_layer_protocol(
       network_observer_.wifi_phy_layer_protocol());
+
+#if defined(OS_ANDROID)
+  SystemProfileProto::Network::NetworkOperator* network_operator =
+      network->mutable_network_operator();
+  network_operator->set_id(network_observer_.network_operator_id());
+#endif
+
   network_observer_.Reset();
 
   SystemProfileProto::OS* os = system_profile->mutable_os();