
Overlays may be overlaid over: * In VideoFrameProcessor, videos or images (or texture input). * In Compositor, other videos. In Compositor, Overlays may consist of video, so it could be confusing for videoFrameAnchor to contrast with overlayAnchor. Also, rename overlayAnchor to overlayFrameAnchor, since it's modifying the anchor in the overlay's frame, so this name seems slightly more precise. PiperOrigin-RevId: 562004292