cros: Added a new function to quick unlock api for checking unfinished pins.

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 63c4074f401b26b265274fb69c4259a468690e19..ff370d0d27cc87f9b4cba1f90be88a995dbfefa2 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -83126,6 +83126,10 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="352" label="Configure allowed quick unlock modes."/>
   <int value="353"
       label="Sets how often user has to enter password to use quick unlock."/>
+  <int value="354" label="Sets the minimum length of the lock screen PIN."/>
+  <int value="355" label="Sets the maximum length of the lock screen PIN."/>
+  <int value="356"
+      label="Enables users to set weak PINs for the lock screen PIN."/>
 </enum>
 
 <enum name="EnterprisePolicyInvalidations" type="int">
@@ -85113,6 +85117,8 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1151" label="SYSTEM_DISPLAY_TOUCHCALIBRATIONRESET"/>
   <int value="1152" label="CERTIFICATEPROVIDER_REQUESTPIN"/>
   <int value="1153" label="CERTIFICATEPROVIDER_STOPPINREQUEST"/>
+  <int value="1154" label="QUICKUNLOCKPRIVATE_CHECKCREDENTIAL"/>
+  <int value="1155" label="QUICKUNLOCKPRIVATE_GETCREDENTIALREQUIREMENTS"/>
 </enum>
 
 <enum name="ExtensionIconState" type="int">