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

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index decb3dd57cd8e45e90437347d2984549e76d7aba..ae61d17550e24c6f6014bd7bec35851833413bf8 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -10579,6 +10579,18 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <summary>The scheme of the URL for each main-frame navigation.</summary>
 </histogram>
 
+<histogram name="NCN.NetworkOperatorMCCMNC_ConnectionChange">
+  <owner>bolian@chromium.org</owner>
+  <owner>bengr@google.com</owner>
+  <owner>marq@google.com</owner>
+  <summary>
+    The MCC (mobile country code) and MNC (mobile network code) of the network
+    operator when the network connection is changed to a mobile network. The
+    first three digits correspond to the MCC, and the rest to the MNC. See
+    reference at: http://en.wikipedia.org/wiki/Mobile_country_code
+  </summary>
+</histogram>
+
 <histogram name="Net.AlternateProtocolBrokenLocation"
     enum="BrokenAlternateProtocolLocation">
   <owner>rch@chromium.org</owner>