GitLab

It seems UIControlsAsh is still used for interactive_ui_tests,
which isn't the case with Mash. Thus I changed the installation
of UIControls for this, meaning:
- do not install the UIControlsAsh on Main of interactive_ui_tests
- create and install UIControlsOzone during PreRunTestOnMainThread.
  This needs to be here since it needs a window tree host.
- fix the positioning logic in UIControlsOzone -- it creates the
  location in root_window's coordinate, which is actually intended
  to be display's coordinate.

BUG=883523
TEST=no breakage on existing tests

Change-Id: I62b1aea1a28deee4dd1d6da377574af8fddef5ed
Reviewed-on: https://chromium-review.googlesource.com/1228942
Commit-Queue: Jun Mukai <mukai@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592252}