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This patch adds platform-specific expectations to this passing test.

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_root_layer_scrolls
Change-Id: I985ce12ac1aafa21eaefa7836422e051df3e07f4
Reviewed-on: https://chromium-review.googlesource.com/803659
Commit-Queue: Philip Rogers <pdr@chromium.org>
Commit-Queue: Stefan Zager <szager@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521037}