GitLab

- Add tests to drag window/tab to overview in tablet mode;
- Fix UIControlsOzone to use host dips instead of host pixels
  with EventInjector and use PointF to avoid rounding errors;

Bug: 942599
Change-Id: I0325749cdd95d4b0c213d09f349083336ec3f3b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1546718
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#647147}