Avoid trans-coding images with gamma 2.2

Previously, these were decoded "AsIs". That feature went away (for
simplicity). Unfortunately, that means that images with gamma 2.2 were
being asked to decode to sRGB, incurring a costly (and destructive)
conversion.

Bug: skia:
Change-Id: I6c8cdfefc052c82a4de37c697c2f659dcdd38d4d
Reviewed-on: https://skia-review.googlesource.com/11352
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed