InputMethodManager (specifically InputMethodManagerImpl) only exists in the browser process, not in ash. That's probably not going to change -- it has a large number of chrome dependencies.

IME support in ash is via ash/ime/ime_controller.h, which might need to be extended. Also, the window server has IME mojo interfaces.

Can we land the workaround CL so that we can play with ARC on mash? We can put it as TODO in the CL and leave this bug open until we have a concrete solution.

It seems ARC is sort of working under mash with just this CL.

Deleted: arc_under_mash.png 385 KB

	arc_under_mash.png 385 KB View Download

Actually, let's keep this and use it for exo.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/29b26a4ba97065b4247debb2a5c759dacb8c5a88

commit 29b26a4ba97065b4247debb2a5c759dacb8c5a88
Author: Darren Shen <shend@chromium.org>
Date: Sun Mar 18 22:36:12 2018

mash: Remove use of InputMethodManager in Wayland server.

We're currently using InputMethodManager in the Wayland server to
observe changes in the keyboard layout. However, under mash, exo will be
in the ash process and InputMethodManager will be in the chrome process,
so we cannot depend on InputMethodManager from the Wayland server.

We remove the use of InputMethodManager in the Wayland server for
observing keyboard changes by using ImeController instead, which uses
Mojo for communication.

We also add a way of retrieving the current keyboard layout from
ImeController. This is a similar design to how ImeController handles
caps lock, but it's simpler because we never need to set the layout
from ash side. Changes to layout on the chrome side just propagate
to the ash side from ImeControllerClient to ImeController.

Bug:  772382 
Change-Id: I84df1ee1b7e0f54716125fec9d4cd49f3442ed79
Reviewed-on: https://chromium-review.googlesource.com/961505
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Oliver Chang <ochang@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543958}
[modify] https://crrev.com/29b26a4ba97065b4247debb2a5c759dacb8c5a88/ash/ime/ime_controller.cc
[modify] https://crrev.com/29b26a4ba97065b4247debb2a5c759dacb8c5a88/ash/ime/ime_controller.h
[modify] https://crrev.com/29b26a4ba97065b4247debb2a5c759dacb8c5a88/ash/ime/ime_controller_unittest.cc
[modify] https://crrev.com/29b26a4ba97065b4247debb2a5c759dacb8c5a88/ash/ime/test_ime_controller.cc
[modify] https://crrev.com/29b26a4ba97065b4247debb2a5c759dacb8c5a88/ash/ime/test_ime_controller.h
[modify] https://crrev.com/29b26a4ba97065b4247debb2a5c759dacb8c5a88/ash/login/ui/login_password_view.h
[modify] https://crrev.com/29b26a4ba97065b4247debb2a5c759dacb8c5a88/ash/public/interfaces/ime_controller.mojom
[modify] https://crrev.com/29b26a4ba97065b4247debb2a5c759dacb8c5a88/ash/system/tray_caps_lock.h
[modify] https://crrev.com/29b26a4ba97065b4247debb2a5c759dacb8c5a88/chrome/browser/ui/ash/ime_controller_client.cc
[modify] https://crrev.com/29b26a4ba97065b4247debb2a5c759dacb8c5a88/chrome/browser/ui/ash/ime_controller_client_unittest.cc
[modify] https://crrev.com/29b26a4ba97065b4247debb2a5c759dacb8c5a88/components/exo/wayland/server.cc

There should be no more references to InputMethodManager in //components/exo.