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The text diffs are due to the new layer tree structure.  The image
diffs are only on Win10, and they appear to be shading differences
due to antialiasing.  Most likely, this is caused by floating point
numerical differences when the printing code applies a zoom factor
to the page.

BUG=711468
R=pdr@chromium.org,skobes@chromium.org
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_root_layer_scrolls

Change-Id: I0d33a98a98bdf5203f26f97ab7787c162619af1c
Reviewed-on: https://chromium-review.googlesource.com/792332Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Steve Kobes <skobes@chromium.org>
Commit-Queue: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519513}