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This avoids a heap allocation per task run.

Change-Id: Id26fe463b29160887d29cb165426101142728550
Reviewed-on: https://chromium-review.googlesource.com/1249311
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594804}