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Generate synthetic clicks and dispatch them via the window service.
Add the remote event dispatcher interface to a new "accessibility"
capability, available only to trusted apps.

Bug: 821471, 628665
Test: Use autoclick on multiple displays with different scale factors
Change-Id: I61352a0849a96a2bc0ae14d0b8afcca051ba67e2
Reviewed-on: https://chromium-review.googlesource.com/961668Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543190}