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This reverts commit 5dd16566.

Reason for revert: This CL was confirmed to be the cause of the perf
regression in crbug.com/978980 - this is artificial so we can reland

Original change's description:
> Revert "Do not coalesce wheel with phaseBegan to wheel with phaseEnded."
>
> This reverts commit 2ca01526.
>
> Reason for revert: Speculative revert for https://crbug.com/978980
>
> Original change's description:
> > Do not coalesce wheel with phaseBegan to wheel with phaseEnded.
> >
> > If no element in the scrolling chain is not scrollable in the given direction
> > (delta_hints) on GSB we latch to the viewport. This is not user friendly on
> > platforms that do not have any scroll affordance animations (e.g. Windows)
> > since if the user changes the scrolling direction and an element in the chain
> > is actually scrollable in the new direction, the user expects it to scroll and
> > has no idea that we have latched to the (possibly unscrollable) viewport for
> > the rest of the scroll sequence. To address the issue for timer based wheel
> > scroll sequence we end the sequence and start a new one upon arrival of a wheel
> > event with different delta directions if no GSU has been consumed since the
> > beginning of the sequence. This cl ensures that the GSE/GSB generated for
> > breaking the latching seqeunce are not coalesced with each other.
> >
> > Bug: 882998
> > Change-Id: Icf703c935475fffd69b899c59abc03ec1b548784
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1524703
> > Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
> > Commit-Queue: Sahel Sharify <sahel@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#641719}
>
> TBR=nzolghadr@chromium.org,sahel@chromium.org
>
> # Not skipping CQ checks because original CL landed > 1 day ago.
>
> Bug: 882998,978980
> Change-Id: I85799b6e6eace029b4c2ef00e142f035ac9e8e4c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1688230
> Reviewed-by: David Bokan <bokan@chromium.org>
> Commit-Queue: David Bokan <bokan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#674615}

TBR=bokan@chromium.org,nzolghadr@chromium.org,sahel@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 882998, 978980
Change-Id: I3dfb3f3ec0467b7101597720325222899e46f10b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1716444Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680315}