don't adapt gray colors to 565

These shallow gradient tests work best if we're using actual gray.
Any green/purple leak into them will just confuse triaging them.

Change-Id: If4a3a136df7a62cbec8b90bf50985db6eb8de204
Reviewed-on: https://skia-review.googlesource.com/147420
Commit-Queue: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed