Support forcing all screenshots into a CPU consumer and enable h/w acceleration in the systemui process while keeping the memory usage down.

https://github.com/CyanogenMod/android_frameworks_native/commit/b2150f9339f2749e52faff2dd6e48854c2d41e03
https://github.com/CyanogenMod/android_frameworks_native/commit/f4486c6ea4bcb728ee0f38df7a8ec75c389d9d2e