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Enables threaded compositing and cross-origin iframe layerization to allow WPTs to pass.

Bug: 910421
Change-Id: Id79d93eb23c36181c0091a7ee8b4164387ea9308
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380813Reviewed-by: Stefan Zager <szager@chromium.org>
Commit-Queue: Andrew Comminos <acomminos@fb.com>
Cr-Commit-Position: refs/heads/master@{#803295}