Enable vertexless shading when path rendering is supported

src/gpu/gl/GrGLProgram.h

Index: src/gpu/gl/GrGLProgram.h
diff --git a/src/gpu/gl/GrGLProgram.h b/src/gpu/gl/GrGLProgram.h
index b18b8ae31ddb6e8339eb9ae724e07cf6bbb59832..f0e03f821ac0a70870f188b2d69ffd2115a7bb43 100644
--- a/src/gpu/gl/GrGLProgram.h
+++ b/src/gpu/gl/GrGLProgram.h
@@ -61,6 +61,8 @@ public:
      */
     GrGLuint programID() const { return fProgramID; }
 
+    bool hasVertexShader() const { return fHasVertexShader; }
+
     /**
      * Some GL state that is relevant to programs is not stored per-program. In particular color
      * and coverage attributes can be global state. This struct is read and updated by
@@ -235,6 +237,9 @@ private:
     GrGLUniformManager          fUniformManager;
     UniformHandles              fUniformHandles;
 
+    bool                        fHasVertexShader;
+    int                         fNumTexGenUnits;
+
     typedef SkRefCnt INHERITED;
 };