GitLab

Add a minimum distance for windows that get tapped and already in a snap region
(windows tapped close too the left or right side of the screen). This is
so users do not accidently snap too easily when trying to activate the
window. Also fix a bug where you can drag very straight across or down
without the overview window moving.

Test: ash_unittests SplitViewWindowSelectorTest.Dragging
Bug: 778933, 781324
Change-Id: I1b4e993951260f079f85851890854dc217ea95f3
Reviewed-on: https://chromium-review.googlesource.com/757985
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517458}