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This behavior is very similar to tablet mode tab drags from the native
tab strip. Some of this code is copied, and some is shared (through
TabletModeBrowserWindowDragSessionWindowsHider).

Bug: 1069869
Change-Id: If5c6f163f7d8af9918be3bc97ca8a91b1df063c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2202507
Commit-Queue: Collin Baker <collinbaker@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770272}