The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/319cfb51173d96f7c00f5f2588fdc0d42ab40024

commit 319cfb51173d96f7c00f5f2588fdc0d42ab40024
Author: Scott Violet <sky@chromium.org>
Date: Wed May 23 18:35:28 2018

chromeos: wires up focus for ws2

This deals with the following:
. Clients may call SetFocus. If this succeeds focus related events go to the
  client that initiated focus.
. Clients can control whether a window is focusable by way of SetCanFocus.
  Currently this is only implemented for non-top-levels.
. If focus goes to a window outside of client calling SetFocus, then
  preference is given to the embedded client.
. If a WindowTreeClient intercepts events, it gets the key events.
. Lastly, this changes it so that enter an capture-changed events are not sent
  to the client. This is because there is a specific capture-changed function
  called on the client. Enter events are a side effect of a move, and need not
  be explicitly sent.

BUG= 837703 
TEST=covered by test

Change-Id: I899e428524ca215d91ec38a859800947034c76c4
Reviewed-on: https://chromium-review.googlesource.com/1069739
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561171}
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/ash/shell.h
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/ash/ws/window_service_owner.cc
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/test_ws/test_ws.cc
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/BUILD.gn
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/README.md
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/client_change.h
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/client_window.cc
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/client_window.h
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/event_test_utils.cc
[add] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/focus_handler.cc
[add] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/focus_handler.h
[add] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/focus_handler_unittest.cc
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/test_window_tree_client.cc
[add] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/window_delegate_impl.cc
[add] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/window_delegate_impl.h
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/window_service.cc
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/window_service.h
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/window_service_client.cc
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/window_service_client.h
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/window_service_client_test_helper.cc
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/window_service_client_test_helper.h
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/window_service_client_unittest.cc
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/window_service_test_setup.cc
[modify] https://crrev.com/319cfb51173d96f7c00f5f2588fdc0d42ab40024/services/ui/ws2/window_service_test_setup.h