Work around VSync signal while screen is off.
Work around VSync signal while screen is off.

Change-Id: I0a9637170ee658ff84a363e91c558892dce5cfaf

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base