Add 3 color variant to gradient bench, include scale in name, add more benchs

R=reed@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/25294003

git-svn-id: http://skia.googlecode.com/svn/trunk@11536 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed