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 3fc48cec80a4fb2f3ce0e3577458c6f20c39c7fb..99c3d5493abdf2cd373b62a2017a241d26ab002c 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -903,6 +903,13 @@ 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