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Regressed in https://crrev.com/c/1825892 that uses a wrong transform
in PartialBoundsRootWindowTransformer.

Bug: 1016565
Change-Id: I56febc2515f2abe26853db6292064de27d3a4e81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873909
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708239}