Use fake Input Device Settings with chrome://device-emulator

chrome/chrome_browser_chromeos.gypi

 # 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.
 
 {
   'variables': {
     # These files lists are shared with the GN build.
     'browser_chromeos_sources': [
         # All .cc, .h, .m, and .mm files under browser/chromeos, except for tests
@@ skipping 1008 matching lines @@
         'browser/chromeos/status/network_menu.h',
         'browser/chromeos/system/automatic_reboot_manager.cc',
         'browser/chromeos/system/automatic_reboot_manager.h',
         'browser/chromeos/system/automatic_reboot_manager_observer.h',
         'browser/chromeos/system/device_change_handler.cc',
         'browser/chromeos/system/device_change_handler.h',
         'browser/chromeos/system/device_disabling_manager.cc',
         'browser/chromeos/system/device_disabling_manager.h',
         'browser/chromeos/system/device_disabling_manager_default_delegate.cc',
         'browser/chromeos/system/device_disabling_manager_default_delegate.h',
+        'browser/chromeos/system/fake_input_device_settings.cc',
+        'browser/chromeos/system/fake_input_device_settings.h',
         'browser/chromeos/system/input_device_settings.cc',
         'browser/chromeos/system/input_device_settings.h',
         'browser/chromeos/system/input_device_settings_impl_ozone.cc',
         'browser/chromeos/system/input_device_settings_impl_x11.cc',
         'browser/chromeos/system/pointer_device_observer.cc',
         'browser/chromeos/system/pointer_device_observer.h',
         'browser/chromeos/system/system_clock.cc',
         'browser/chromeos/system/system_clock.h',
         'browser/chromeos/system/system_clock_observer.cc',
         'browser/chromeos/system/system_clock_observer.h',
@@ skipping 345 matching lines @@
         'browser/chromeos/attestation/attestation_signed_data.proto',
       ],
       'variables': {
         'proto_in_dir': 'browser/chromeos/attestation',
         'proto_out_dir': 'chrome/browser/chromeos/attestation',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }