Added UMA metrics for ChromeOS first-run UI.

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 36d7b0c19404bf164b796322ccfdd9cdfe492275..ee08dfad46e68476b4c27491f77f026be043f47a 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -1718,6 +1718,43 @@ other types of suffix sets.
   </summary>
 </histogram>
 
+<histogram name="CrosFirstRun.DialogShown">
+  <summary>
+    Records the number of times when first-run dialog was shown.
+  </summary>
+</histogram>
+
+<histogram name="CrosFirstRun.FurthestStep">

[Alexei Svitkine (slow), 2014/01/15 16:02:38]

Can you add an enum for the steps?

[dzhioev (left Google), 2014/01/15 22:12:54]

We want to know how many steps user saw rather than which step was last. Order
of steps could change eventually, new steps could appear. That's why we can't
use enum here.

[Alexei Svitkine (slow), 2014/01/15 22:21:36]

Okay, please expand the description here to capture this motivation.

[dzhioev (left Google), 2014/01/16 13:21:14]

Done.

+  <summary>Index of furthest step that was reached during tutorial.</summary>
+</histogram>
+
+<histogram name="CrosFirstRun.TimeSpent" units="ms">
+  <summary>The total time that user spent on first-run tutorial.</summary>
+</histogram>
+
+<histogram name="CrosFirstRun.TimeSpentOnAppListStep" units="ms">

[Alexei Svitkine (slow), 2014/01/15 16:02:38]

For all the CrosFirstRun.TimeSpentOn* histograms, can you use a <fieldtrial>
block to create common-suffixed histograms (see examples in this file and some
info at the top of the file on how to do this and), to avoid repeating these?
Then, you can add "CrosFirstRun.TimeSpentOn" as an <affected-histogram>. (Note
that you can specify a custom separator string on the fieldtrial block).

[dzhioev (left Google), 2014/01/15 22:12:54]

Done.

+  <summary>The time that user spent on &quot;app-list&quot; step.</summary>
+</histogram>
+
+<histogram name="CrosFirstRun.TimeSpentOnHelpStep" units="ms">
+  <summary>The time that user spent on &quot;help&quot; step.</summary>
+</histogram>
+
+<histogram name="CrosFirstRun.TimeSpentOnTrayStep" units="ms">
+  <summary>The time that user spent on &quot;tray&quot; step.</summary>
+</histogram>
+
+<histogram name="CrosFirstRun.TutorialCompletion"
+    enum="CrosFirstRunTutorialCompletionType">
+  <summary>Tracks the way how user left tutorial.</summary>
+</histogram>
+
+<histogram name="CrosFirstRun.TutorialLaunched">
+  <summary>
+    Records the number of times when first-run tutorial has been launched.
+  </summary>
+</histogram>
+
 <histogram name="DataReductionProxy.BypassInfoFallback"
     enum="DataReductionProxyBypassEventType">
   <summary>
@@ -22629,6 +22666,12 @@ other types of suffix sets.
   <int value="0" label="ModemManagerCommandSendFailure"/>
 </enum>
 
+<enum name="CrosFirstRunTutorialCompletionType" type="int">
+  <int value="0" label="Was not finished"/>
+  <int value="1" label="Finished with &quot;Got It&quot; button"/>
+  <int value="2" label="Finished with &quot;Keep Exploring&quot; button"/>
+</enum>
+
 <enum name="CrosShelfClickTarget" type="int">
   <obsolete>
     Deprecated as of 12/2013. Default pinned apps trial is finished.