Merge "Revert "SurfaceFlinger: add a sysprop for GL backpressure"" into qt-dev am: de17b13a2f am: 65dc300533 am: 63bbbb4ed7
am: 7fbf4b52f0

Change-Id: I0cde9d5c6915620d78a4c476d6dfa627d16d972a