GitLab

Skips the reposition if the window is not dropped into overview on
drag end.

Test: added test, manual
Change-Id: I80635aa657e8a2017b72b06992a1f98181754bed
Fixed: 1049206
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2496192
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823345}