GitLab

To avoid priority inversion, we need to use a different thread for post
*to* the mixer than we use for post data *from* the mixer.

Bug: internal b/106289282
Change-Id: I9dec6b2a4f8b38d7895de3d076e48c1e1ef6491b
Reviewed-on: https://chromium-review.googlesource.com/1095858Reviewed-by: Stephen Lanham <slan@chromium.org>
Commit-Queue: Kenneth MacKay <kmackay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566544}