Isolate VertexBuilder from GrGLShaderBuilder
Adds a nested class to GrGLShaderBuilder called VertexBuilder. Now
GrGLShaderBuilder can only modify the fragment shader directly. In
order to modify the vertex shader, the client code needs to call
getVertexShader, which will return null for vertex-less shaders.
R=bsalomon@google.com
Author: cdalton@nvidia.com
Review URL: https://chromiumcodereview.appspot.com/23754003
git-svn-id: http://skia.googlecode.com/svn/trunk/src@11046 2bbb7eff-a529-9590-31e7-b0007b416f81
12 files changed
