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- Touch event comes with coordinate where its origin is its root window
  host.

  Hardware. Confirm that ChromeVox works well on it, e.g. you can
  activate an element on the screen, etc.

Bug: 887222
Test: Enable spoken feedback on touch controller of Hangout Meet
Change-Id: I6bd6b50f13405c493659ad91f24d35974d5c72ce
Reviewed-on: https://chromium-review.googlesource.com/c/1282688Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Yuki Awano <yawano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600612}