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 3beae8927a1fa80f5b903877df4f881b2266fdd4..3259224bd00aa447ed0e1dffe4e83cb8b7ddb3c7 100644
--- a/chrome/browser/chromeos/login/quick_unlock/quick_unlock_utils.cc
+++ b/chrome/browser/chromeos/login/quick_unlock/quick_unlock_utils.cc
@@ -30,6 +30,7 @@ void RegisterQuickUnlockProfilePrefs(PrefRegistrySimple* registry) {
   registry->RegisterIntegerPref(
       prefs::kQuickUnlockTimeout,
       static_cast<int>(QuickUnlockPasswordConfirmationFrequency::DAY));
+  registry->RegisterBooleanPref(prefs::kEnableQuickUnlockFingerprint, false);
 }
 
 bool IsPinUnlockEnabled(PrefService* pref_service) {
@@ -58,6 +59,14 @@ bool IsPinUnlockEnabled(PrefService* pref_service) {
   return base::FeatureList::IsEnabled(features::kQuickUnlockPin);
 }
 
+bool IsFingerprintUnlockEnabled() {
+  // Enable fingerprint unlock only if the switch is present. The fingerprint
+  // settings are under the lock screen so we cannot set it up without
+  // kQuickUnlockPin enabled, so make sure that feature is turned on as well.
+  return base::FeatureList::IsEnabled(features::kQuickUnlockPin) &&
+         base::FeatureList::IsEnabled(features::kQuickUnlockFingerprint);
+}
+
 void EnableQuickUnlockForTesting() {
   enable_for_testing_ = true;
 }