cros: Enable Ext4 migration in ARC kiosk mode.

tools/metrics/histograms/enums.xml

Index: tools/metrics/histograms/enums.xml
diff --git a/tools/metrics/histograms/enums.xml b/tools/metrics/histograms/enums.xml
index 4f057e4a70e43f7bc093f2a7d3849cc309aef9f1..a1de4e469a511cc7104ebdefdb0ddb6126142dee 100644
--- a/tools/metrics/histograms/enums.xml
+++ b/tools/metrics/histograms/enums.xml
@@ -24698,6 +24698,7 @@ from previous Chrome versions.
   <int value="0" label="Ready"/>
   <int value="1" label="Resume"/>
   <int value="2" label="LowStorage"/>
+  <int value="3" label="ArcKiosk"/>
 </enum>
 
 <enum name="MigrationUIMigrationResult" type="int">
@@ -24709,6 +24710,10 @@ from previous Chrome versions.
   <int value="5" label="Request failure in resumed migration"/>
   <int value="6" label="Mount failure in new migration"/>
   <int value="7" label="Mount failure in resumed migration"/>
+  <int value="8" label="Success in arc kiosk migration"/>
+  <int value="9" label="General failure in arc kiosk migration"/>
+  <int value="10" label="Request failure in arc kiosk migration"/>
+  <int value="11" label="Mount failure in arc kiosk migration"/>
 </enum>
 
 <enum name="MigrationUIRemoveCryptohomeResult" type="int">
@@ -24716,6 +24721,8 @@ from previous Chrome versions.
   <int value="1" label="Success in resumed migration"/>
   <int value="2" label="Failure in new migration"/>
   <int value="3" label="Failure in resumed migration"/>
+  <int value="4" label="Success in arc kiosk migration"/>
+  <int value="5" label="Failure in arc kiosk migration"/>
 </enum>
 
 <enum name="MigrationUIScreen" type="int">