Adding pref to store the user-selected proximity threshold.

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 443 matching lines @@
 extern const char kNotificationsVibrateEnabled[];
 #endif
 
 extern const char kPushMessagingAppIdentifierMap[];
 
 extern const char kGCMProductCategoryForSubtypes[];
 
 extern const char kEasyUnlockAllowed[];
 extern const char kEasyUnlockEnabled[];
 extern const char kEasyUnlockPairing[];
+extern const char kEasyUnlockProximityThreshold[];
 extern const char kEasyUnlockProximityRequired[];
 
 #if BUILDFLAG(ENABLE_EXTENSIONS)
 extern const char kToolbarIconSurfacingBubbleAcknowledged[];
 extern const char kToolbarIconSurfacingBubbleLastShowTime[];
 #endif
 
 #if BUILDFLAG(ENABLE_WEBRTC)
 extern const char kWebRTCMultipleRoutesEnabled[];
 extern const char kWebRTCNonProxiedUdpEnabled[];
@@ skipping 452 matching lines @@
 extern const char kClipboardLastModifiedTime[];
 #endif
 
 #if BUILDFLAG(ENABLE_OFFLINE_PAGES)
 extern const char kOfflinePrefetchBackoff[];
 #endif
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_