[Smart Lock] Add a setting to require close proximity in order for unlocking to work.

components/proximity_auth.gypi

 # Copyright 2014 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.
 
 {
   'targets': [
     {
       'target_name': 'proximity_auth',
       'type': 'static_library',
       'include_dirs': [
@@ skipping 19 matching lines @@
         "proximity_auth/client_observer.h",
         "proximity_auth/connection.cc",
         "proximity_auth/connection.h",
         "proximity_auth/connection_finder.h",
         "proximity_auth/connection_observer.h",
         "proximity_auth/proximity_auth_system.cc",
         "proximity_auth/proximity_auth_system.h",
         "proximity_auth/remote_device.h",
         "proximity_auth/remote_status_update.cc",
         "proximity_auth/remote_status_update.h",
+        "proximity_auth/switches.cc",
+        "proximity_auth/switches.h",
         "proximity_auth/secure_context.h",
         "proximity_auth/wire_message.cc",
         "proximity_auth/wire_message.h",
       ],
     },
     {
       # GN version: //components/cryptauth/proto
       'target_name': 'cryptauth_proto',
       'type': 'static_library',
       'sources': [
@@ skipping 16 matching lines @@
         '../google_apis/google_apis.gyp:google_apis',
         '../net/net.gyp:net',
       ],
       'sources': [
         "proximity_auth/cryptauth/cryptauth_api_call_flow.cc",
         "proximity_auth/cryptauth/cryptauth_api_call_flow.h",
       ],
     },
   ],
 }