Attempt at fixing color cube bench

The original bench was hitting the cache since it was using the same color filter for all loops. By creating a new color filter within the loop, at least this part of it is solved. I'm not 100% sure this is the right way, but at least the numbers are a bit more reasonable and are affected by the output resolution.

BUG=skia:

Review URL: https://codereview.chromium.org/648483002
1 file changed