Move loops that chain together effects into GrGLShaderBuilder from GrGLProgram.

R=robertphillips@google.com

Review URL: https://codereview.chromium.org/14925010

git-svn-id: http://skia.googlecode.com/svn/trunk@9073 2bbb7eff-a529-9590-31e7-b0007b416f81
6 files changed