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When a user tries to drag a visible on all desks window to a specific
desk in overview mode, they are unable to. Currently there is no visual
indicator that nothing happened.

This CL adds a toast for when this happens and also prevents the desks
mini views from highlighting when a user drags a visible on all desks
window over the mini views.

Test: manual
Bug: 1163697
Change-Id: I43acbfb9b90567dbeef294ac97c0e6cc5af33bdd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2616319Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Commit-Queue: Jeremy Chinsen <chinsenj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842191}