Enable vertexless shading when path rendering is supported

src/gpu/gl/GrGLShaderBuilder.h

Index: src/gpu/gl/GrGLShaderBuilder.h
diff --git a/src/gpu/gl/GrGLShaderBuilder.h b/src/gpu/gl/GrGLShaderBuilder.h
index 42df62ac4583bb62df6870be74719b0ebefa208f..d0bbb4d30c1ba271103b043917aed809123e3cb7 100644
--- a/src/gpu/gl/GrGLShaderBuilder.h
+++ b/src/gpu/gl/GrGLShaderBuilder.h
@@ -168,6 +168,12 @@ public:
                         const char* body,
                         SkString* outName);
 
+    void addTexGenUnit(GrSLType type,
+                       SkString* fsInName = NULL,
+                       int* unitIdx = NULL,
+                       int* numComponents = NULL);
+    int getNumTexGenUnits() { return fNumTexGenUnits; }
+
     /** Add input/output variable declarations (i.e. 'varying') to the fragment shader. */
     GrGLShaderVar& fsInputAppend() { return fFSInputs.push_back(); }
     GrGLShaderVar& fsOutputAppend() { return fFSOutputs.push_back(); }
@@ -488,8 +494,9 @@ private:
     GrGLUniformManager::UniformHandle   fDstCopyScaleUniform;
 
     bool                                fTopLeftFragPosRead;
+    int                                 fNumTexGenUnits;
 
-    SkAutoTDelete<VertexBuilder> fVertexBuilder;
+    SkAutoTDelete<VertexBuilder>        fVertexBuilder;
 };
 
 #endif