Add more UMAs for Instance ID

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 4cd6fc81fc082bab27945e135322d81cb872a5d2..a0cd67d6533966779950499d0606748f46a500c7 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -13718,6 +13718,26 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="InstanceID.DeleteTokenCompleteTime" units="milliseconds">
+  <owner>jianli@chromium.org</owner>
+  <summary>
+    Length of time taken to complete the DeleteToken request successfully. If
+    the request is retried multiple times, the length of time is counted for the
+    last successful retry.
+  </summary>
+</histogram>
+
+<histogram name="InstanceID.DeleteTokenRequestStatus"
+    enum="GCMUnregistrationRequestStatus">
+  <owner>juyik@chromium.org</owner>
+  <summary>Status code of the outcome of DeleteToken request.</summary>
+</histogram>
+
+<histogram name="InstanceID.DeleteTokenRetryCount">
+  <owner>jianli@chromium.org</owner>
+  <summary>Number of retries before DeleteToken succeeds.</summary>
+</histogram>
+
 <histogram name="InstanceID.Enabled" enum="BooleanEnabled">
   <owner>jianli@chromium.org</owner>
   <summary>
@@ -13726,6 +13746,40 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="InstanceID.GetTokenCompleteTime" units="milliseconds">
+  <owner>jianli@chromium.org</owner>
+  <summary>
+    Length of time taken to complete the GetToken request successfully. If the
+    request is retried multiple times, the length of time is counted for the
+    last successful retry.
+  </summary>
+</histogram>
+
+<histogram name="InstanceID.GetTokenRequestStatus"
+    enum="GCMUnregistrationRequestStatus">
+  <owner>juyik@chromium.org</owner>
+  <summary>Status code of the outcome of GetToken request.</summary>
+</histogram>
+
+<histogram name="InstanceID.GetTokenRetryCount">
+  <owner>jianli@chromium.org</owner>
+  <summary>Number of retries before GetToken succeeds.</summary>
+</histogram>
+
+<histogram name="InstanceID.RestoredIDs">

[Alexei Svitkine (slow), 2015/06/04 18:59:32]

Nit: RestoreIDCount .. so the name makes it obvious that it's a count, not e.g.
a boolean

[jianli, 2015/06/04 20:50:22]

Done.

+  <owner>jianli@chromium.org</owner>
+  <summary>
+    Number of Instance IDs restored from the persistent store at startup.
+  </summary>
+</histogram>
+
+<histogram name="InstanceID.RestoredTokens">

[Alexei Svitkine (slow), 2015/06/04 18:59:32]

Ditto.

[jianli, 2015/06/04 20:50:22]

Done.

+  <owner>jianli@chromium.org</owner>
+  <summary>
+    Number of InstanceID tokens restored from the persistent store at startup.
+  </summary>
+</histogram>
+
 <histogram name="Instant.InstantControllerEvent" enum="InstantControllerEvent">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>