Add a GrGpuGL reference for GrGLProgram/GrGLUniformManager

Updates GrGLProgram and GrGLUniformManager to keep a GrGpuGL reference
instead of one for GrGLContextInfo. No change in functionality, this
is in preparation to support fixed function GL calls for vertexless
shaders.

R=bsalomon@google.com

Author: cdalton@nvidia.com

Review URL: https://chromiumcodereview.appspot.com/23636011

git-svn-id: http://skia.googlecode.com/svn/trunk@11111 2bbb7eff-a529-9590-31e7-b0007b416f81
8 files changed