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This is part of efforts to replace non-per-frame task runners with other
appropriate task runners in the renderer.

Bug: 804694
Change-Id: Ibcb96b6461fda0d777edcb961bc21294fcc5cf23
Reviewed-on: https://chromium-review.googlesource.com/897308Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534026}