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This just runs blink_perf.layout with the NG flag.

TESTED=tools/perf/run_benchmark run blink_perf.layout_ng --browser=release -v
(and verified that the commandline includes the layoutng flag)

Change-Id: I4302330462d52291d96d3d8509498337e267a1f4
Reviewed-on: https://chromium-review.googlesource.com/1185641Reviewed-by: Emil A Eklund <eae@chromium.org>
Reviewed-by: Annie Sullivan <sullivan@chromium.org>
Commit-Queue: Annie Sullivan <sullivan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585475}