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 1004 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',

[Nico, 2016/06/30 17:25:51]

we usually consider files called fake_foo to be test files and try to not
include them in the shipping binary. maybe this should be renamed to
simulated_input_device_settings now?

[stevenjb, 2016/07/01 18:53:49]

I don't know about "usually" but for chrome os we set a precedent for "Fake" a
while back for the implementations that run on linux. (Networking, 

Originally it was "Stub" but as the stubs gained more functionality people
didn't like that name so we named them all Fake. "Simulated" is arguably more
descriptive, but "Fake" is consistent with the existing code.

         '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 343 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' ]
     },
   ],
 }