Fix incorrect layout rects with 3d transforms.
Fix incorrect layout rects with 3d transforms.

Addresses https://code.google.com/p/trace-viewer/issues/detail?id=514

BUG=

Review URL: https://codereview.chromium.org/134973004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@166544 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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