Separate ARC++ Provisioning Histogram into managed and unmanaged

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 edfe252772965e0350e02f6d75f453a54ef84ed6..943a6d5ece37015aa83ed5906441c4fe93385958 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -1209,6 +1209,10 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Arc.Provisioning.Result" enum="ArcProvisioningResult">
+  <obsolete>
+    Deprecated on 2016-09-15 and replaced by Arc.Provisioning.Result.Managed and
+    Arc.Provisioning.Result.Unmanaged.
+  </obsolete>
   <owner>alexchau@google.com</owner>
   <owner>phweiss@google.com</owner>
   <summary>
@@ -1216,6 +1220,25 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Arc.Provisioning.Result.Managed" enum="ArcProvisioningResult">
+  <owner>alexchau@google.com</owner>
+  <owner>phweiss@google.com</owner>
+  <summary>
+    The result (success or the type of failure) of ARC provisioning on managed
+    devices.
+  </summary>
+</histogram>
+
+<histogram name="Arc.Provisioning.Result.Unmanaged"
+    enum="ArcProvisioningResult">
+  <owner>alexchau@google.com</owner>
+  <owner>phweiss@google.com</owner>
+  <summary>
+    The result (success or the type of failure) of ARC provisioning on unmanaged
+    devices.
+  </summary>
+</histogram>

[jwd, 2016/09/19 14:58:33]

You could use suffixes for this, you'd need to keep the original histogram
intact though, so you may not want to. If you're planning on doing this
managed/unmanaged splitting of other histograms though, it may be worth it to do
suffixes.

If you want to keep the old one obsolete, you can create a new histogram to base
your suffixes off of.

Leaving it up to you.

+
 <histogram name="Arc.Provisioning.TimeDelta.Failure.Managed" units="ms">
   <owner>alexchau@google.com</owner>
   <owner>phweiss@google.com</owner>