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... the window has an un-identity transform in place.

This is to fix the animation when snapping an overview window in clamshell mode.

Bug: 890029
TEST: Manually
Change-Id: I5d05eee296b16a5b84da10bfbad848c78969c8a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1731697
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Mitsuru Oshima (OOO 8/12,13) <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686477}