Follow-up changes to Android certificate verification logic.

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 006a749a9c3eb2ea630d5166c63fd594113560fb..6d1cdd91e4f27fa7e3b5a1865ca896afbd956863 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -8725,6 +8725,12 @@ other types of suffix sets.
   </summary>
 </histogram>
 
+<histogram name="Net.FoundSystemTrustRootsAndroid" enum="Boolean">
+  <summary>
+    Whether the system trust roots were found on Android 4.2 and up.

[Ryan Sleevi, 2014/01/21 20:35:07]

Better to be a little more verbose.

Whether or not system installed trust anchors could be distinguished from user
installed trust anchors. Only recorded on Android 4.2 and later.

That is, IF some other image/vendor uses some other naming scheme, and we added
support for it, I'd still like to see the histogram record the same. At least,
that's my thought?

[davidben, 2014/01/21 20:39:58]

Done.

+  </summary>
+</histogram>
+
 <histogram name="Net.FtpDataConnectionErrorCount" enum="FtpDataConnectionError">
   <summary>The number of times each FTP Error was observed.</summary>
 </histogram>