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This CL ensures that when dragging the selected region by an edge
affordance, that the capture region is resized only in the expected
direction.

Test: manual, updated test
Change-Id: Icd2691592deb180db55b84f8e394b2e8935a3858
Fixed: 1140778
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490866
Commit-Queue: Richard Chui <richui@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820054}