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This patch tries to different between users who want to use the trackpad
to quickly switch desks and users who use the trackpad to look at the
contents of adjacent desks.

For the former, we introduce a threshold of 500ms. If the user ends
their swipe within 500ms, we will move them to the next desk if the
next desk is more than 10% visible.

For the latter, we keep the old logic of moving them to the desk
which is most visible when the swipe ends.

Also lowers the threshold when starting a swipe. We had some feedback
that this was too high.

Bug: 1158065, 1158067
Test: manual, added tests
Change-Id: I9feb8f8a8f591227f883d58bfe9c38b1653f7fa4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617044
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842891}