if bounds don't intersect in DIFF mode, just return src (don't return empty) Review URL: https://codereview.appspot.com/6337052
if bounds don't intersect in DIFF mode, just return src (don't return empty)
Review URL: https://codereview.appspot.com/6337052

csulmone/skia,csulmone/skia,csulmone/skia,csulmone/skia