This was discussed in Chromium code review: https://chromium-review.googlesource.com/c/chromium/src/+/6701775/comment/7d6966c4_2a5487e3/, where @fdwr proposed to support uint8 input for resample2d for image input

For uint8, currently resample2d is specified to take float16/float32, and so uint8 couldn't reach here anyway. Though, I agree that adding uint8 to WebNN resample makes sense (and maybe even int8), since most incoming pixel data is 8-bit, and this allows the graph to directly accept pixel data to apply any transformations to floating point, without requiring each caller to manually do that outside graph processing.