Add Easy Unlock options to chrome://settings behind a flag.

chrome/common/pref_names.h

 // Copyright (c) 2012 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.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 
 #include <stddef.h>
@@ skipping 390 matching lines @@
 extern const char kFullscreenAllowed[];
 
 extern const char kLocalDiscoveryNotificationsEnabled[];
 
 extern const char kPreferenceResetTime[];
 extern const char kProfileResetPromptMemento[];
 
 extern const char kGCMChannelEnabled[];
 extern const char kGCMRegisteredAppIDs[];
 
+extern const char kEasyUnlockEnabled[];
+extern const char kEasyUnlockShowTutorial[];
+extern const char kEasyUnlockPairing[];
+
 // Local state prefs. Please add Profile prefs above instead.
 extern const char kCertRevocationCheckingEnabled[];
 extern const char kCertRevocationCheckingRequiredLocalAnchors[];
 extern const char kSSLVersionMin[];
 extern const char kSSLVersionMax[];
 extern const char kCipherSuiteBlacklist[];
 extern const char kEnableOriginBoundCerts[];
 extern const char kDisableSSLRecordSplitting[];
 extern const char kEnableUnrestrictedSSL3Fallback[];
 
@@ skipping 522 matching lines @@
 
 #if defined(OS_ANDROID)
 extern const char kPartnerBookmarkMappings[];
 #endif
 
 extern const char kQuickCheckEnabled[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_