The display wake lock and other internal state could become out of sync if we happened to execute the power manager's update function concurrently due to the missing lock. This bug can be trigged due to display state changes or proximity sensor updated. Although it would be extremely rare, we have some evidence of this happening on at least a few devices resulting in rapid power drain with the screen off or a crash. Bug: 9880044 Change-Id: I3c674ce429621a50cbb36c3a01883d5f388205b2
cherrypick from ics-mr1 docs: source for nw app Change-Id: If50f407a0e56fa802fe9beedaa650e3a131872b2
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