Added UMA statistics for Chrome Cleaner.

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 d65f0d3d557d9fdadb1118d1b55a98e6104beb71..67fb8204495eb02e5385f9cf360126c8fb37a45f 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -32884,6 +32884,29 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="SoftwareReporter.Cleaner.ExitCode">
+  <owner>mad@chromium.org</owner>
+  <summary>The exit code of the software reporter cleaner tool.</summary>
+</histogram>
+
+<histogram name="SoftwareReporter.Cleaner.HasCompleted" enum="BooleanEnabled">

[Alexei Svitkine (slow), 2014/10/30 14:02:24]

Please add a BooleanCompleted enum entry to the file and reference it, instead
of BooleanEnabled.

[Georges Khalil, 2014/10/30 14:44:53]

Done.

+  <owner>mad@chromium.org</owner>
+  <summary>
+    Whether the software reporter cleaner tool has finished execution, otherwise
+    assume it has crashed.
+  </summary>
+</histogram>
+
+<histogram name="SoftwareReporter.Cleaner.RunningTime" units="ms">
+  <owner>mad@chromium.org</owner>
+  <summary>How long it took to run the software reporter cleaner tool.</summary>
+</histogram>
+
+<histogram name="SoftwareReporter.Cleaner.Version">
+  <owner>mad@chromium.org</owner>
+  <summary>The build version of the software reporter cleaner tool.</summary>
+</histogram>
+
 <histogram name="SoftwareReporter.MajorVersion">
   <owner>mad@chromium.org</owner>
   <summary>