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A delayed task OnWatchdogTimeout() is posted during watchdog thread init. It will
continue posting the next delayed timeout task when no GPU hang is detected.

A atomic counter is incremented by one in Arm() or Disarm(), and by two in
ReportProgress(). When OnWatchdogTimeout() task is running, it checks if the
counter increases from the last timeout (i.e still running) or if the counter
is an even number (i.e. disarmed). If not, Watchdog thread will crash deliberately
in order to recover from gpu hang.




Bug:949839

Change-Id: Ie0e98c9e7621068a5143bf9c3a70cc8a6267955a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1674786
Commit-Queue: Maggie Chen <magchen@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672789}