md-settings: Added settings for fingerprint unlock.

chrome/browser/chromeos/login/quick_unlock/quick_unlock_utils.cc

Index: chrome/browser/chromeos/login/quick_unlock/quick_unlock_utils.cc
diff --git a/chrome/browser/chromeos/login/quick_unlock/quick_unlock_utils.cc b/chrome/browser/chromeos/login/quick_unlock/quick_unlock_utils.cc
index 653539f33e80be9c0637cd9b0fab027a0bfffa81..79307a4700eb164296d48478c1adaa37ac161351 100644
--- a/chrome/browser/chromeos/login/quick_unlock/quick_unlock_utils.cc
+++ b/chrome/browser/chromeos/login/quick_unlock/quick_unlock_utils.cc
@@ -36,6 +36,8 @@ void RegisterQuickUnlockProfilePrefs(PrefRegistrySimple* registry) {
   // 0 indicates no maximum length for the pin.
   registry->RegisterIntegerPref(prefs::kPinUnlockMaximumLength, 0);
   registry->RegisterBooleanPref(prefs::kPinUnlockWeakPinsAllowed, true);
+
+  registry->RegisterBooleanPref(prefs::kEnableQuickUnlockFingerprint, false);
 }
 
 bool IsPinUnlockEnabled(PrefService* pref_service) {
@@ -64,6 +66,11 @@ bool IsPinUnlockEnabled(PrefService* pref_service) {
   return base::FeatureList::IsEnabled(features::kQuickUnlockPin);
 }
 
+bool IsFingerprintUnlockEnabled() {
+  // Enable fingerprint unlock only if the switch is present.
+  return base::FeatureList::IsEnabled(features::kQuickUnlockFingerprint);
+}
+
 void EnableQuickUnlockForTesting() {
   enable_for_testing_ = true;
 }