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The present CL modifies code that was based on a bad assumption: that
dragging always begins with one of the kFrom* window dragging states.

Test: manual
Fixed: 1024513
Change-Id: Id515edfc9344af8a86ca49b14583af244b248652
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918034Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Avery Musbach <amusbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715993}