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..52236bb917264fb3da35c2ed9492f79cee8dfd51 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -10579,6 +10579,17 @@ 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" units="count">

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

nit: No need for such a generic unit.  Units are nice to add when they clarify
semantics, but not required otherwise.

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

Done.

+  <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. Each MCC and MNC has three digits. If the decimal  integer has
+    less than six digits, read it as prefix padding it  with zeros.

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

nit: There are several doubled-up spaces that should be single spaces, e.g.
between "it" and "with" on this line.

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

I don't see how the decimal integer could have less than six digits, unless it's
the pair (0, 0) representing an unknown carrier (which, btw, you're not
currently logging in the C++ code -- is that intentional)?  All of the MCCs seem
to be three-digit numbers that do not start with zero.

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

Done.

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

I was thinking the case when MCC is 001, so when converting it to integer the
prefix "00" will be lost. But given that is only the test network, I should
ignore that.

Yes, I intent to not logging unknown or no operator case. I think that does not
provide useful information.

+  </summary>
+</histogram>
+
 <histogram name="Net.AlternateProtocolBrokenLocation"
     enum="BrokenAlternateProtocolLocation">
   <owner>rch@chromium.org</owner>