Get gradient information for gpu effect directly from SkGradientShader instead of calling asAGradient

BUG=skia:
R=bsalomon@google.com

Author: egdaniel@google.com

Review URL: https://codereview.chromium.org/241173005

git-svn-id: http://skia.googlecode.com/svn/trunk@14254 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed