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These tests:
virtual/threaded/fast/events/pinch/pinch-zoom-into-center.html
virtual/threaded/fast/events/pinch/pinch-zoom-pan-position-fixed.html
pinch-zoom-pan-within-zoomed-viewport.html

were breaking because Mac doesn't support touch events and the pinch
was being done using touch. I've changed to use a touchpad source as
this doesn't affect the meaning of the tests as well as some minor
cleanups.

While here, I also rewrote a number of tests to use gesture-util.js and
the async/await style which is more readable and easier to produce
non-flaky tests.

TBR=nasko@chromium.org

Bug: 854199,873435,877494,877361
Change-Id: I19f6e199fea694013d3dceaeb32c881059301f1d
Reviewed-on: https://chromium-review.googlesource.com/1185238
Commit-Queue: David Bokan <bokan@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Sahel Sharify <sahel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585871}