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Changes cast system gesture handling so that events which happen on
the side swipe margin are replayed when the finger is lifted before
leaving the margin area, allowing UI elements to be accessed in the
margin.

Note: A refactoring of the side swipe detection into an EventRewriter
was necessary to allow for the redispatching of the stashed
events. The side swipe detection was factored out into a separate
class, leaving the tap/press handling in the EventHandler.

Bug: internal b/111304882
Test: manual and unit tests
Change-Id: If446ed0d97bc9e5f127c311e98f0ed8289071dd3
Reviewed-on: https://chromium-review.googlesource.com/1141060Reviewed-by: Kevin Schoedel <kpschoedel@chromium.org>
Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Commit-Queue: Ryan Daum <rdaum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576150}