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This API was not implemented in the Chrome task runner.
The implementation will allow us to make the API pure virtual upstream.

Change-Id: I44598d5c0410ed6019de7c8042bfa2ae54b96544
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040112Reviewed-by: Brandon Tolsch <btolsch@chromium.org>
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739019}