[hwcomposer] Don't waitVsync if we haven't activated vsync yet
Review Request #126083 - Created Nov. 16, 2015 and submitted
Would just hit the timeout, no need to wait 16 msec for nothing. [hwcomposer] Add support for backlight through light_device_t We use the hw module's backlight and set the color to either 0 or FF depending on whetehr we want to have the screen on or off. This turns the backlight off properly. It is bound to the toggleBlank functionality so that we always turn on/off the backlight depending on whether our compositor is on or off. In addition we listen to key release events on the power button to toggle the state.