Make GrGLProgram no longer depend on kNumStages

R=robertphillips@google.com

Review URL: https://codereview.chromium.org/16158007

git-svn-id: http://skia.googlecode.com/svn/trunk@9462 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed