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 01046f244f4e5212b403acaf923607aa841a7fca..3abb3fc4842d404f5880fc8d22c018025272fd31 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -1227,6 +1227,10 @@ 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>
@@ -1234,6 +1238,25 @@ 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>
+
 <histogram name="Arc.Provisioning.TimeDelta.Failure.Managed" units="ms">
   <owner>alexchau@google.com</owner>
   <owner>phweiss@google.com</owner>