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In order to use cc::TouchAction on the blink mojom API we require it the
definition to move to somewhere blink can depend on (not content).

Being that touch_action is defined in CC it seems natural to introduce it
there.

BUG=1008432

Change-Id: I62ab198a169bd242d36e27a5357636800e296593
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1867036Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708796}