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In order to provide a better user experience, we allow cancelling drag-to-close
and switch it to normal drag once the drag location enters the desks bar bounds.
This way users won't have to drop the item first and start dragging again.

Demo: https://bugs.chromium.org/p/chromium/issues/detail?id=972371#c3

BUG=866622, 972371
TEST=Manually, Added a new test.

Change-Id: I9c5683ed04eff230633d09f81837c1db45883f81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1703544Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678024}