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 6a7249dd3af0fbc0969acda7f36eadd82e8923cd..a6a1e7c3f303dae7c8a5b6d8a854200c0a35cb2d 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -919,6 +919,12 @@ const char kQuickUnlockModeWhitelist[] = "quick_unlock_mode_whitelist";
 // 2 - day. Users will have to enter their password every day.
 // 3 - week. Users will have to enter their password every week.
 const char kQuickUnlockTimeout[] = "quick_unlock_timeout";
+// 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