md-settings: Added settings for fingerprint unlock.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_QUICK_UNLOCK_QUICK_UNLOCK_UTILS_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_QUICK_UNLOCK_QUICK_UNLOCK_UTILS_H_
 
 class PrefRegistrySimple;
 class PrefService;
 
@@ skipping 10 matching lines @@
   WEEK = 3
 };
 
 // Register quick unlock prefs.
 void RegisterQuickUnlockProfilePrefs(PrefRegistrySimple* registry);
 
 // Returns true if PIN unlock is allowed by policy and the quick unlock feature
 // flag is present.
 bool IsPinUnlockEnabled(PrefService* pref_service);
 
+// Returns true if the fingerprint unlock feature flag is present.
+bool IsFingerprintUnlockEnabled();
+
 // Forcibly enable quick-unlock for testing.
 void EnableQuickUnlockForTesting();
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_QUICK_UNLOCK_QUICK_UNLOCK_UTILS_H_