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So that we could get more consistent data across runs.

BUG=717744

Change-Id: I78eba114b1d4b603448725fefcc20ce3a3e1db71
Reviewed-on: https://chromium-review.googlesource.com/919314Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Yuzhu Shen <yzshen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537184}