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This includes 2 thread hops, 2 serialize, 2 deserialize:
serialize + hop-to-worker + deserialize + serialize +
hop-to-main + deserialize.

Bug: 870041
Change-Id: I324ba46f09ab18522e51430c6d58c4f07001bc74
Reviewed-on: https://chromium-review.googlesource.com/1159321Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Shubhie Panicker <panicker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581407}