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Revert of Revert of Forward input and compositing tasks to the Blink scheduler (patchset #1 id:1 of https://codereview.chromium.org/548253002/)

Reason for revert:
this didn't reduce flakiness

Original issue's description:
> Revert of Forward input and compositing tasks to the Blink scheduler (patchset #21 id:400001 of https://codereview.chromium.org/363383002/)
>
> Reason for revert:
> suspecting it's causing the high rate of flakes in Instrumentation test ContentShellTest
>
> BUG=411756
>
> Original issue's description:
> > Forward input and compositing tasks to the Blink scheduler
> >
> > Instead of posting input and compositor tasks directly to the
> > main thread message loop, forward them to the Blink scheduler
> > so they can be prioritized over other tasks.
> >
> > BUG=391005
> >
> > Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=290845
> >
> > Committed: https://chromium.googlesource.com/chromium/src/+/68bab3290b45a8610ad875d3c92530477c16a948
>
> TBR=jamesr@chromium.org,alexclarke@chromium.org,picksi@chromium.org,eseidel@chromium.org,skyostil@chromium.org
> NOTREECHECKS=true
> NOTRY=true
> BUG=391005
>
> Committed: https://chromium.googlesource.com/chromium/src/+/66f85d5405417e6ddd11e1b9be677062a2e3ae4f

TBR=jamesr@chromium.org,alexclarke@chromium.org,picksi@chromium.org,eseidel@chromium.org,skyostil@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=411756

Review URL: https://codereview.chromium.org/548333002

Cr-Commit-Position: refs/heads/master@{#293722}