Allow delta of 1 for srgb format comparsion

Due to rounding and precession, the red channel can have value of
0x7f instead of 0x80 for SRGB case.
Allow delta of 1 for srgb format comparision.

Bug: 122272984
Change-Id: I630e73693ff37f77828fa666c4ba532c6baa3f99
1 file changed