This reverts commit 858491ba13ab5d45a5ec462d002b5856703b1b2b
It turns out that Surface Flinger is supposed to generate fake vsyncs while the screen is off, but sometimes it wasn't working due to a bug. That bug has now been fixed by the following change: I7c6abc23bb021d1dfc94f101bd3ce18e3a81a73e