Added histograms for tracking new user's priority prefs sync time and results.

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 b13b369b4f61b5c71b0575e4c7a6cbc9620bfcd9..0301347b2028b8b40bf0351741df5cb4eb2962e9 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -4084,14 +4084,14 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="CrosFirstRun.DialogShown">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
+  <owner>dzhioev@chromium.org</owner>
   <summary>
     Records the number of times when first-run dialog was shown.
   </summary>
 </histogram>
 
 <histogram name="CrosFirstRun.FurthestStep">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
+  <owner>dzhioev@chromium.org</owner>
   <summary>
     Index of furthest step that was reached during tutorial. Since order of
     steps could change eventially and new steps could apear we use index here
@@ -4100,23 +4100,23 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="CrosFirstRun.TimeSpent" units="ms">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
+  <owner>dzhioev@chromium.org</owner>
   <summary>The total time that user spent on first-run tutorial.</summary>
 </histogram>
 
 <histogram name="CrosFirstRun.TimeSpentOnStep" units="ms">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
+  <owner>dzhioev@chromium.org</owner>
   <summary>The time that user spent on some step of tutorial.</summary>
 </histogram>
 
 <histogram name="CrosFirstRun.TutorialCompletion"
     enum="CrosFirstRunTutorialCompletionType">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
+  <owner>dzhioev@chromium.org</owner>
   <summary>Tracks the way how user left tutorial.</summary>
 </histogram>
 
 <histogram name="CrosFirstRun.TutorialLaunched">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
+  <owner>dzhioev@chromium.org</owner>
   <summary>
     Records the number of times when first-run tutorial has been launched.
   </summary>
@@ -14281,6 +14281,23 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Login.NewUserPriorityPrefsSyncResult"
+    enum="NewUserPriorityPrefsSyncResult">
+  <owner>dzhioev@chromeos.org</owner>
+  <summary>
+    Tracks how many times waiting for new user's priority prefs sync met a time
+    limit, and how many times it didn't.

[Ilya Sherman, 2015/05/15 17:36:40]

nit: Suggested rephrasing: "Records whether a new user's priority prefs sync
timed out."

[dzhioev (left Google), 2015/05/15 20:36:50]

Done.

+  </summary>
+</histogram>
+
+<histogram name="Login.NewUserPriorityPrefsSyncTime" units="milliseconds">
+  <owner>dzhioev@chromeos.org</owner>
+  <summary>
+    Time spent waiting for priority preferences to sync after new user sign in.
+    Can't exceed a limit of 10s.

[Ilya Sherman, 2015/05/15 17:36:40]

nit: Suggested rephrasing for the second sentence: "The operation will time out
after 10s."  Or, if that's not true, and you're simply reflecting the histogram
bound, then maybe it would be better to change the histogram bound to be equal
to the timeout?

[dzhioev (left Google), 2015/05/15 20:36:50]

Done.
No, it's fine, we actually have a 10s limit.

+  </summary>
+</histogram>
+
 <histogram name="Login.PolicyFilesStatePerBoot" enum="LoginPolicyFilesState">
   <owner>cmasone@chromium.org</owner>
   <summary>The state of Chrome OS owner key and device policy files.</summary>
@@ -58675,6 +58692,11 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="6" label="URL blocked for supervised user"/>
 </enum>
 
+<enum name="NewUserPriorityPrefsSyncResult" type="int">
+  <int value="0" label="Succeed"/>
+  <int value="1" label="Timed out"/>
+</enum>
+
 <enum name="NotificationActionType" type="int">
   <int value="0" label="Unknown"/>
   <int value="1" label="Notification added"/>