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Programmatic smooth scrolls should also be instant if the smooth scroll
flag is explicitly disabled.

Previously landed in https://crrev.com/c/1536759

To reland, this CL force enables the scroll animator in Blink web
tests. Without this, the usual flow for determining if the animator is
enabled is followed, which leads to inconsistencies. On Mac, the
animator is enabled in Chrome but not in content shell. This leads to
inconsistencies with other platforms (Mac tests ran without smooth
scroll while Linux/Windows ran with) and ensuring we test what we ship.

This change required some minor fixes to tests that assumed instant
scroll on Mac (and uncovered one real bug).

Bug: 944583
Change-Id: I114d8b882d9855fbe0c43645575a1cdd7c3b6e61
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2009842Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735006}