Implement the private API for quick unlock.

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 d863572c2733f299fb71c56256be1f26fa2d6e94..3c4152151c007295a314fefe2b353b2974a11e95 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -73296,6 +73296,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1135" label="SYSTEM_DISPLAY_OVERSCANCALIBRATIONCOMPLETE"/>
   <int value="1136" label="AUTOFILLPRIVATE_GETCOUNTRYLIST"/>
   <int value="1137" label="RUNTIME_RESTARTAFTERDELAY"/>
+  <int value="1138" label="QUICKUNLOCKPRIVATE_SETMODES"/>
+  <int value="1139" label="QUICKUNLOCKPRIVATE_GETACTIVEMODES"/>
+  <int value="1140" label="QUICKUNLOCKPRIVATE_GETAVAILABLEMODES"/>
 </enum>
 
 <enum name="ExtensionIconState" type="int">
@@ -73717,6 +73720,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="196" label="kEnterpriseDeviceAttributes"/>
   <int value="197" label="kCertificateProvider"/>
   <int value="198" label="kResourcesPrivate"/>
+  <int value="199" label="kQuickUnlockPrivate"/>
 </enum>
 
 <enum name="ExtensionServiceVerifyAllSuccess" type="int">