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This returns to the current task's task runner. Note there are some
situations where this is not valid:

* When we're not running a task (it will DCHECK).
* When we're in a one-off base::ThreadPool task (it will DCHECK).
* In non-scheduler backed threads (it will DCHECK).

Bug: 835323
Change-Id: I3a789557247240e0c36a47339574350d79746144
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1834094
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707484}