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Forces layout tests to run in a debug mode.

Bug: 818832
Change-Id: I860e41169ea759e32806ba4ab45ca4e0d72ba4cd
Reviewed-on: https://chromium-review.googlesource.com/1014634Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551230}