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Most "scrolling" tests in Blink are in the fast/scrolling and
fast/events directories, the latter due to testing touch, wheel,
keyboard, etc. events. Many of these will use eventSender and so avoid
the composited path entirely so they provide just some mildly useful
main-thread scrolling coverage. Some do use gpuBenchmarking and are thus
more useful.

Bug: 836913,840017,841342,841423
Change-Id: Idc4c2fae7ee7a48f074df8b3df5a027a75c82f71
Reviewed-on: https://chromium-review.googlesource.com/1052823Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557533}