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;
 
 namespace chromeos {
 
 // Enumeration specifiying the possible intervals before a strong auth
 // (password) is required to use quick unlock. These values correspond to the
 // policy items of QuickUnlockTimeout (policy ID 352) in policy_templates.json,
 // and should be updated accordingly.
 enum class QuickUnlockPasswordConfirmationFrequency {
   SIX_HOURS = 0,
   TWELVE_HOURS = 1,
   DAY = 2,
   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.

[jdufault, 2016/12/06 18:13:42]

nit: newline above

[sammiequon, 2016/12/06 18:55:37]

Done.

+bool IsFingerprintUnlockEnabled();
 
 // Forcibly enable quick-unlock for testing.
 void EnableQuickUnlockForTesting();
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_QUICK_UNLOCK_QUICK_UNLOCK_UTILS_H_