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This is needed for implementing PostTaskHere and base::CurrentThread traits.
In a follow on patch SimpleTaskExecutor will be added for blink threads.

Bug: 835323
Change-Id: Ice25d2a93fc7a6a10c0a4d4e43aa82a97462e3c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832280
Commit-Queue: Alex Clarke <alexclarke@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702046}