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Like previous RLS rebaselines, the layer trees reflect composited
scrolling layers for documents, the elimination of PLC layers on
iframes, and "flattenInheritedTransform": false (crbug.com/778060).

"Child Containment Layer" appears for iframes that are composited by
transform, but lack scrolling layers because they have no overflow or
have scrolling="no" (crbug.com/784053).

Bug: 544140
Change-Id: I03f5cf370724ff2f00de8f8f6b497fa0f39af76e
Reviewed-on: https://chromium-review.googlesource.com/902746Reviewed-by: Stefan Zager <szager@chromium.org>
Commit-Queue: Steve Kobes <skobes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534697}