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 be826304aedbcf5d17beb15d390ff9c4377c6a4f..823cba0efe0e32863c7af3f964809f7e453a589c 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -82793,6 +82793,10 @@ 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">
@@ -84780,6 +84784,8 @@ 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">