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Import wpt/css/css-images so existing images tests can be upstreamed.

No-Export: true
Bug: 630597
Change-Id: I034a5c02eb3b1b91aceea9579b3f6f84414a7a41
Reviewed-on: https://chromium-review.googlesource.com/898224
Commit-Queue: Chris Nardi <cnardi@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534059}