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

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index c1302453ba6e8ca86a8ee60fc43d01e6a18bd491..25e57083e329710624c55654a100c2c49d44e839 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -909,6 +909,13 @@ const char kEolStatus[] = "eol_status";
 // Boolean pref indicating the End Of Life notification was dismissed by the
 // user.
 const char kEolNotificationDismissed[] = "eol_notification_dismissed";
+
+// Integer prefs indicating the minimum and maximum lengths of the lock screen
+// pin.
+const char kPinUnlockMinimumLength[] = "pin_unlock_minimum_length";
+const char kPinUnlockMaximumLength[] = "pin_unlock_maximum_length";
+// Boolean pref indicating whether users are allowed to set easy pins.
+const char kPinUnlockAllowWeakPins[] = "pin_unlock_allow_weak_pins";
 #endif  // defined(OS_CHROMEOS)
 
 // A boolean pref set to true if a Home button to open the Home pages should be