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the closest edge.

Bug: 883098
Bug: 841886
Bug: b/115291749
Test: Drag PIP window to the middle of the screen - it animates back to
Test: Added unittests
Change-Id: Ibf19f50c4e4298ea126c1a1986f014076e4592f1
Reviewed-on: https://chromium-review.googlesource.com/c/1221010
Commit-Queue: Eliot Courtney <edcourtney@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600262}