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Ash's DragDropController is modified to specially handle drags from the
WebUI tab strip when a flag is enabled. Dropping a tab over an area that
doesn't support accepting the drop will open a new window with only that
tab.

Bug: 1069869
Change-Id: I9ee06a497f8557a3c8e0defff10c8edc1993514c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2130812Reviewed-by: John Lee <johntlee@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Collin Baker <collinbaker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758922}