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You shall be able to start dragging from overview, drag to another
display, and snap.

Test: ash_unittests All/SplitViewOverviewSessionInClamshellTestMultiDisplayOnly.DragFromOneDisplayToAnotherAndSnap/0
Bug: 961170
Change-Id: Ib237fa253603433d307f232d0fc8a04affebeb7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1986956
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729792}