Require two failed pings of the audio thread to crash.
Require two failed pings of the audio thread to crash.

Increases the duration to two minutes and requires two pings fails
to trigger a crash. Speculative change to avoid suspend states
for which the client isn't notified.

Also moves task posting outside of the lock in case the MessageLoop
is processing other queue additions.

BUG=471046
TEST=none

Review URL: https://codereview.chromium.org/1054773002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#323411}

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