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This is for the detailed audio stack tracing. There have been several
audio performance issues reported from the applications that use
Web Audio and MediaSteam together. We need more information on why
the audio rendering thread or AudioWorkletThread is blocked.

Bug: 1072727
Change-Id: I56d33d6bf471938815c7aba3f8b94ad461f9c3b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145557
Commit-Queue: Hongchan Choi <hongchan@chromium.org>
Reviewed-by: Stephen Nusko <nuskos@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762023}