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1. Prevents deadlocks from AsyncInvoker destructor 2. Makes future state() calls are guaranteed to return the new state after SetState() completes. I am not sure if it is allowed to call FireOnChanged from non-signaling threads so I will leave the post for now. Bug: webrtc:10813 Change-Id: I5712a45f71431765898037867382397d537570a0 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/147727 Commit-Queue: Sami Kalliomäki <sakal@webrtc.org> Reviewed-by: Magnus Jedvert <magjed@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28741}