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This saves ~60 microseconds per posted task (~90% of posted task
overhead).

Bug: internal b/167285412
Change-Id: I1b644c0d5a68799e0852768078841831b6d437b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2599583
Commit-Queue: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839019}