GitLab

For a fling event, if the hotseat was hidden when the drag started,
only if the fling event position exceeds the restore-to-maximized
threshold, the window will be taken back to home screen.

Also, remove the logic to decide if drag can be allowed from
DragWindowFromShelfController as ShelfLayoutManager already handled it.

Bug: 997885
Change-Id: I35b9c35df1477b92b5c01db49c9302b6f3bace60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1902176
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713677}