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 ca35c97d952057ac0ac97f6f9a04a65ad46a7b29..73ebd8d133046024673134673fd192cf90a8c0c8 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -82304,6 +82304,10 @@ 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">
@@ -84285,6 +84289,8 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1146" label="LANGUAGESETTINGSPRIVATE_DISABLELANGUAGE"/>
   <int value="1147" label="FILEMANAGERPRIVATEINTERNAL_GETDIRECTORYSIZE"/>
   <int value="1148" label="BLUETOOTHLOWENERGY_SETADVERTISINGINTERVAL"/>
+  <int value="1149" label="QUICKUNLOCKPRIVATE_CHECKCREDENTIAL"/>
+  <int value="1150" label="QUICKUNLOCKPRIVATE_GETCREDENTIALREQUIREMENTS"/>
 </enum>
 
 <enum name="ExtensionIconState" type="int">