Recognize common parametric gamma

5% of images with ICC profiles (in my test set of 10k)
have this exact gamma representation, which is very close
to 2.2f.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2027413002

Review-Url: https://codereview.chromium.org/2027413002
1 file changed