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In https://crrev.com/c/1332769 we removed the vsync aligned feature
flag. This caused the removal of much code in GestureEventQueue. Namely,
it no longer attempts to coalesce and queue events.

This CL cleans up the nomenclature and commentary in the class to better
reflect its current duties.

Bug: 625689
Change-Id: I295fec7923b8d251853b9522c54641edfcac076a
Reviewed-on: https://chromium-review.googlesource.com/c/1334203Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607998}