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Prior to this CL, no filters testing was performed at
device_scale_factor != 1. This adds both the css3/filters and the
WPT/css/filter-effects tests to device_scale_factor 2 testing.

SHERIFFS: if this CL causes flakiness in any of the new
/virtual/scalefactor200/* tests, please disable those tests
in TestExpectations rather than reverting this CL. There is a
section for 968791 that you can add to. Thanks!

Bug: 968791
Change-Id: I1c63a50cc80b75d6ba7eef80afbe1ba36b84be7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1638661Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665975}