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Based on a trybot run as well as Szager's test tool, 18 tests
are failing and 8 tests are passing.

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_root_layer_scrolls
Change-Id: I04880039367d9896a87467f8196d5510d6aec7db
Reviewed-on: https://chromium-review.googlesource.com/748703Reviewed-by: Steve Kobes <skobes@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513188}