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

chrome/browser/metrics/metrics_network_observer.h

Index: chrome/browser/metrics/metrics_network_observer.h
diff --git a/chrome/browser/metrics/metrics_network_observer.h b/chrome/browser/metrics/metrics_network_observer.h
index bcec85e00e539d682742c01b0cc4d487cc2f99f6..e59e60e905bda7150f3552a35f6a80369eaaaa0f 100644
--- a/chrome/browser/metrics/metrics_network_observer.h
+++ b/chrome/browser/metrics/metrics_network_observer.h
@@ -39,6 +39,10 @@ class MetricsNetworkObserver
     return wifi_phy_layer_protocol_is_ambiguous_;
   }
 
+  std::string network_operator_id() const {
+    return network_operator_id_;
+  }
+
   SystemProfileProto::Network::WifiPHYLayerProtocol
   wifi_phy_layer_protocol() const;
 
@@ -49,6 +53,9 @@ class MetricsNetworkObserver
   // net::GetWifiPHYLayerProtocol.
   void OnWifiPHYLayerProtocolResult(net::WifiPHYLayerProtocol mode);
 
+  void GetNetworkOperatorID();
+  void OnNetworkOperatorID(std::string);
+
   base::WeakPtrFactory<MetricsNetworkObserver> weak_ptr_factory_;
 
   // True if |connection_type_| changed during the lifetime of the log.
@@ -62,6 +69,8 @@ class MetricsNetworkObserver
   // net::GetWifiPHYLayerProtocol.
   net::WifiPHYLayerProtocol wifi_phy_layer_protocol_;
 
+  std::string network_operator_id_;
+
   DISALLOW_COPY_AND_ASSIGN(MetricsNetworkObserver);
 };