Add virtual test suite to test LayoutNG code with fast/block/basic layout tests

For now mark all fast/block/basic tests with "Failure". This will be changed once
crrev.com/2389823003 is submitted.

BUG=635619

Review-Url: https://codereview.chromium.org/2392703002
Cr-Commit-Position: refs/heads/master@{#422629}
3 files changed