Added uma for pin unlock set up.

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 ccb015218961048b5dfb1b1cfa73160813bd231d..995643bd0a0a9878d2491434089e4fbf8bacde06 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -54707,6 +54707,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>The number of pinned tabs opened when a profile is loaded.</summary>
 </histogram>
 
+<histogram name="Settings.PinUnlockSetup" enum="PinUnlockSetupType">
+  <owner>sammiequon@chromium.org</owner>
+  <summary>
+    The users progress throught the pin unlock setup wizard. Each type

[jdufault, 2016/09/13 18:36:05]

throught => through

[sammiequon, 2016/09/13 19:21:40]

Done.

+    corresponds to the user completeing a different stage of the setup wizard.
+  </summary>
+</histogram>
+
 <histogram name="Settings.RegisterProfilePrefsTime" units="ms">
   <owner>rkaplow@chromium.org</owner>
   <summary>
@@ -90250,6 +90258,14 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="5" label="Uncompleted"/>
 </enum>
 
+<enum name="PinUnlockSetupType" type="int">
+  <int value="0" label="Start screen lock"/>
+  <int value="1" label="Enter password correctly"/>
+  <int value="2" label="Choose pin or password"/>
+  <int value="3" label="Enter pin"/>
+  <int value="4" label="Confirm pin"/>
+</enum>
+
 <enum name="PipelineStatus" type="int">
   <int value="0" label="PIPELINE_OK"/>
   <int value="1" label="PIPELINE_ERROR_URL_NOT_FOUND"/>