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When you drag a window from the shelf and drop into overview, it shall
be positioned correctly and stacked correctly.

Test: ash_unittests DragWindowFromShelfControllerTest.DropsIntoOverviewAtCorrectPosition
Change-Id: I198084bfe644c70de00d6824623106dff1776f63
Fixed: 1047821
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032797Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738255}