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If someone suspends their computer and resumes more than a minute
later, the browser io thread may tick before the audio thread can
update the last tick time ==> crash :(

The solution is to disable hang detection during suspend and only
reenable it once resume completes; at which point we can update
the tick count. If we're actually hung, we'll crash after the next
interval elapses.

BUG=471046
TEST=none

Review URL: https://codereview.chromium.org/1036933003

Cr-Commit-Position: refs/heads/master@{#322509}