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This change will allow for the detection of tasks running in
TaskScheduler that fail to post their task in a COM STA Task Runner
instead.

BUG=706512

Change-Id: If8ea9df63cface0dc48aa11b5254ab3e6d87dc4f
Reviewed-on: https://chromium-review.googlesource.com/549223
Commit-Queue: Robert Liao <robliao@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487269}