[Merge M57] arc: Handle metrics for Auth operations.

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 71cebbf60a6c7a60f024f83fbed63e553ed44167..0c617b745f7d4fa560935b9e7cff4e847f7b0f05 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -1570,6 +1570,36 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="ArcAuth.CheckinAttempts" units="attempts">
+  <owner>elijahtaylor@chromium.org</owner>
+  <summary>
+    Number of attempts done while waiting for the check-in task to be completed.
+    0 means that device was already checked-in. This is recorded in case
+    check-in task is completed successfully.
+  </summary>
+</histogram>
+
+<histogram name="ArcAuth.CheckinTime" units="ms">
+  <owner>elijahtaylor@chromium.org</owner>
+  <summary>
+    Elapsed time waiting for the check-in task to be completed. This is recorded
+    in case check-in task is completed successfully.
+  </summary>
+</histogram>
+
+<histogram name="ArcAuth.NetworkWaitTime" units="ms">
+  <owner>elijahtaylor@chromium.org</owner>
+  <summary>
+    Elapsed time waiting for network connection before starting other
+    authorization operations.
+  </summary>
+</histogram>
+
+<histogram name="ArcAuth.SignInTime" units="ms">
+  <owner>elijahtaylor@chromium.org</owner>
+  <summary>Elapsed time waiting for GMS sign-in to complete.</summary>
+</histogram>
+
 <histogram name="ArcRuntime.LowMemoryKiller.FreedSize" units="KB">
   <obsolete>
     Renamed to Arc.LowMemoryKiller.FreedSize on 2016/03/24.