The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7493b52a7df965340262a60de51780cbf978dbff

commit 7493b52a7df965340262a60de51780cbf978dbff
Author: derat <derat@chromium.org>
Date: Thu Jan 19 00:45:37 2017

mash: Fix TabletPowerButtonController segfault.

Make TabletPowerButtonController check that
ui::InputDeviceManager exists before trying to register
itself with it.

BUG= 682403 , 682460 

Review-Url: https://codereview.chromium.org/2645523004
Cr-Commit-Position: refs/heads/master@{#444571}

[modify] https://crrev.com/7493b52a7df965340262a60de51780cbf978dbff/ash/system/chromeos/power/tablet_power_button_controller.cc

I think kylechar@ created a instance of ui::InputDeviceManager in mash that bridges to the UI service over mojo. I'll take a look.

Yep, there should be an InputDeviceClient instance that implements InputDeviceManager in mash.

https://cs.chromium.org/chromium/src/services/ui/public/cpp/input_devices/input_device_client.h

I think ash should have an instance, but maybe I'm thinking of mushrome?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6f336c50912b9f4e2e3e8ed401e87461715ab872

commit 6f336c50912b9f4e2e3e8ed401e87461715ab872
Author: James Cook <jamescook@chromium.org>
Date: Wed Oct 25 15:08:19 2017

cros: Fix ui::InputDeviceManager usage for mash

The ash process now has an InputDeviceManager, so we don't need to
check for null or skip tests that use it.

Convert PaletteTrayTests to avoid usage of DeviceDataManagerTestAPI,
since DeviceDataManager doesn't exist on mash.

Bug:  682460 ,  734812 
Test: ash_unittests
Change-Id: If0d75de124af664f530f6cce5af6f95588c8265c
Reviewed-on: https://chromium-review.googlesource.com/735130
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#511462}
[modify] https://crrev.com/6f336c50912b9f4e2e3e8ed401e87461715ab872/ash/system/palette/palette_tray_test_api.h
[modify] https://crrev.com/6f336c50912b9f4e2e3e8ed401e87461715ab872/ash/system/palette/palette_tray_unittest.cc
[modify] https://crrev.com/6f336c50912b9f4e2e3e8ed401e87461715ab872/ash/system/power/power_button_display_controller.cc
[modify] https://crrev.com/6f336c50912b9f4e2e3e8ed401e87461715ab872/ash/system/status_area_widget_unittest.cc
[modify] https://crrev.com/6f336c50912b9f4e2e3e8ed401e87461715ab872/testing/buildbot/filters/ash_unittests_mash.filter
[modify] https://crrev.com/6f336c50912b9f4e2e3e8ed401e87461715ab872/testing/buildbot/filters/ash_unittests_mus.filter