Create GLSLUniformHandler class for gpu backend

src/gpu/glsl/GrGLSLVertexShaderBuilder.h

Index: src/gpu/glsl/GrGLSLVertexShaderBuilder.h
diff --git a/src/gpu/glsl/GrGLSLVertexShaderBuilder.h b/src/gpu/glsl/GrGLSLVertexShaderBuilder.h
index b76721fd00b82cf3e4f5b0e0ddbb707f13693129..2e1289ff0297ee6836da1fd0a0dc593bbbdfd769 100644
--- a/src/gpu/glsl/GrGLSLVertexShaderBuilder.h
+++ b/src/gpu/glsl/GrGLSLVertexShaderBuilder.h
@@ -11,13 +11,17 @@
 #include "GrGLSLShaderBuilder.h"
 #include "GrGeometryProcessor.h"
 
+class GrGLSLUniformHandler;
 class GrGLSLVarying;
 
+// Enough precision to represent 1 / 2048 accurately in printf
+#define GR_SIGNIFICANT_POW2_DECIMAL_DIG 11
+
 class GrGLSLVertexBuilder : public GrGLSLShaderBuilder {
 public:
     GrGLSLVertexBuilder(GrGLSLProgramBuilder* program);
 
-    void transformToNormalizedDeviceSpace(const GrShaderVar& posVar);
+    void transformToNormalizedDeviceSpace(GrGLSLUniformHandler*, const GrShaderVar& posVar);
 private:
     void onFinalize() override;