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This CL allows dragging a tab to the edge of the screen to create
a new window with the tab.

Bug: 1087850
Change-Id: I366d8acaa949a693341fd7159a643c738bddd386
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2251055
Commit-Queue: edchin <edchin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795073}