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With browser side fling the fling_controller can tell if the GFC cancels
the fling or not. Thus the tap suprression controller doesn't need to
wait for the ack of the GFC. Stashing a tap(mouse) down event and
dropping or forwarding it later on is not necessary either since on the
arrival of these events the tap suppression controller already knows
whether the GFC has cancelled an active fling or not.

TBR=kinuko@chromium.org

Bug: 249063
Change-Id: I89beff953a0c660bd6151864debe507be8c775ed
Reviewed-on: https://chromium-review.googlesource.com/1033537
Commit-Queue: Sahel Sharifymoghaddam <sahel@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554770}