Bug 1422: NewtCanvasSWT: Handle case of !OSX && DPIUtil.getScalingFactor() > 1
NewtCanvasSWT.SWTNativeWindow's surfaceSize in pixel units shall only return scaled-up windowUnits using SWTAccessor.deviceZoomScaleUp(..) for !OSX and potentially auto scaled-up pixelUnits to passthrough (OSX).
See detailed API doc to NewtCanvasSWT.newtScaleUp(..)