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 10a462fc7dd2b11959222cb84f0f8cbc6ac321e1..2ef2f4b4c362d5e4fe613eddcd4761d40f9ac18a 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -1385,6 +1385,33 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Arc.Auth.CheckinAttempts" units="attempts">
+  <owner>elijahtaylor@google.com</owner>
+  <summary>
+    Number of attempts did while waiting for checkin task completed before GMS
+    sign-in. 0 means that device was already checked-in prior to GMS sign-in.
+  </summary>
+</histogram>
+
+<histogram name="Arc.Auth.CheckinTime" units="ms">
+  <owner>elijahtaylor@google.com</owner>
+  <summary>
+    Elapsed time waiting for checkin task completed before GMS sign-in.
+  </summary>
+</histogram>
+
+<histogram name="Arc.Auth.NetworkWaitTime" units="ms">
+  <owner>elijahtaylor@google.com</owner>
+  <summary>
+    Elapsed time waiting for network connection before GMS sign-in.
+  </summary>
+</histogram>
+
+<histogram name="Arc.Auth.SignInTime" units="ms">
+  <owner>elijahtaylor@google.com</owner>
+  <summary>Elapsed time waiting for GMS sign-in completed.</summary>
+</histogram>
+
 <histogram name="Arc.boot_progress" units="ms">
   <owner>elijahtaylor@google.com</owner>
   <owner>mitsuji@google.com</owner>