Use referenceFrame when Sensor API used

[jsantell]

via @pozdnyakov #10 (comment)

@cvan @jsantell FYI, screen coordinates synchronization for the Accelerometer, Gyroscope, LinearAcceleration, AbsoluteOrientationSensor and RelativeOrientationSensor
classes is available now in Chrome canaries (starting from 66.0.3350.0). In practice, it means that if you create a sensor object passing {referenceFrame:"screen"} to the constructor (e.g. new RelativeOrientationSensor({frequency: 60, referenceFrame:"screen"})) the screen coordinate system will be used to resolve the sensor readings. So, there will be no need to remap sensor readings on JS side when the screen orientation changes.

[jsantell]

• UA sniffing for m63-m65, now spec will throw if constructor options invalid

[cvan]

just FYI: as of a week ago, in Chrome the Sensor API is now enabled by default (without needing to flip a flag)