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It originally send key down on tap down, and key up on tap, but this
was changed to just key down on tap, because some gestures send the tap
event and the browser listens to just the key up.

But ARC apps need the entire sequence, so this sends both on click.

Original bug: https://bugs.chromium.org/p/chromium/issues/detail?id=943154

Test: manual
Bug: b/129248267
Change-Id: I5e5d16f4dc6a675d1a96936ad938e5201ad74aa1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1542224
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#646441}