[Bug 1055270] [KK Only][Flame][Camera] Face detection coordinates are in...

...verted
technically, these should not actually be the viewport or the screen dimensions. I think what you actually have to pass here are the scaled dimensions of the preview stream. If the aspect ratio of the preview stream does not match the aspect ratio of the screen, then some of the preview will extend beyond the edge of the screen, and you need to pass the larger size for correct scaling.