Resetting metrics ids on clump detection.

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 1a4329edb1d661ed76faed9b1b07bc372cd1ea67..03eebf62230a9cae8fdb3683d42667587a97ecb9 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -27629,12 +27629,21 @@ other types of suffix sets.
 </histogram>
 
 <histogram name="UMA.MachineIdState" enum="UmaMachineIdState">
-  <sumary>
+  <owner>jwd@chromium.org</owner>
+  <summary>
     Tracks if the machine ID is generated successfully and if it changes from
     one run to the next. The machine ID is a 24-bit hash of machine
     characteristics. It is expected to change if an install of Chrome is copied
     to multiple machines. This check happens once per browser startup.
-  </sumary>
+  </summary>
+</histogram>
+
+<histogram name="UMA.MetricsIDsReset" enum="Boolean">

[Alexei Svitkine (slow), 2014/03/28 19:49:02]

Hmm, this will likely not have a clean merge with my CL. I wonder if there's
another good name that can be used that would avoid that...

Also, change Boolean to BooleanHit.

[jwd, 2014/03/28 19:58:58]

Done.

+  <owner>jwd@chromium.org</owner>
+  <summary>
+    A count of the number of times the metrics ids (client id and low entropy
+    source) have been reset due to a cloned install being detected.
+  </summary>
 </histogram>
 
 <histogram name="UMA.Perf.GetData" enum="GetPerfDataOutcome">
@@ -27970,7 +27979,7 @@ other types of suffix sets.
 </histogram>
 
 <histogram name="Variations.SeedDateChange" enum="VariationsSeedDateChange">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
+  <owner>jwd@chromium.org</owner>
   <summary>
     Counts if a response from the variations server is the first response of the
     day or not. This is counted when a new valid seed or a 304 is received. The