fix up GrGLProgrambuilder precision on varyings

src/gpu/gl/builders/GrGLGeometryShaderBuilder.h

Index: src/gpu/gl/builders/GrGLGeometryShaderBuilder.h
diff --git a/src/gpu/gl/builders/GrGLGeometryShaderBuilder.h b/src/gpu/gl/builders/GrGLGeometryShaderBuilder.h
index c4c019be189fc12a21d568c5bbcc226fdb22728a..4fe8a239616d18a01ad08de33ff95a0971599e72 100644
--- a/src/gpu/gl/builders/GrGLGeometryShaderBuilder.h
+++ b/src/gpu/gl/builders/GrGLGeometryShaderBuilder.h
@@ -20,7 +20,7 @@ private:
     /*
      * an internal call for GrGLFullProgramBuilder to add varyings
      */
-    void addVarying(const char* name, GrGLVarying*);
+    void addVarying(const char* name, GrSLPrecision precision, GrGLVarying*);
 
     bool compileAndAttachShaders(GrGLuint programId, SkTDArray<GrGLuint>* shaderIds);