Create GLSLUniformHandler class for gpu backend

src/gpu/glsl/GrGLSLVertexShaderBuilder.cpp

Index: src/gpu/glsl/GrGLSLVertexShaderBuilder.cpp
diff --git a/src/gpu/glsl/GrGLSLVertexShaderBuilder.cpp b/src/gpu/glsl/GrGLSLVertexShaderBuilder.cpp
index 73c0fcd81e1d4d5fa0027977994e30bd582a49f3..be6dcfe33b738b2a0b865015353aef46f8b248c4 100644
--- a/src/gpu/glsl/GrGLSLVertexShaderBuilder.cpp
+++ b/src/gpu/glsl/GrGLSLVertexShaderBuilder.cpp
@@ -7,6 +7,7 @@
 
 #include "GrGLSLVertexShaderBuilder.h"
 #include "glsl/GrGLSLProgramBuilder.h"
+#include "glsl/GrGLSLUniformHandler.h"
 #include "glsl/GrGLSLVarying.h"
 
 GrGLSLVertexBuilder::GrGLSLVertexBuilder(GrGLSLProgramBuilder* program)
@@ -14,7 +15,8 @@ GrGLSLVertexBuilder::GrGLSLVertexBuilder(GrGLSLProgramBuilder* program)
     , fRtAdjustName(nullptr) {
 }
 
-void GrGLSLVertexBuilder::transformToNormalizedDeviceSpace(const GrShaderVar& posVar) {
+void GrGLSLVertexBuilder::transformToNormalizedDeviceSpace(GrGLSLUniformHandler* uniformHandler,
+                                                           const GrShaderVar& posVar) {
     SkASSERT(!fRtAdjustName);
 
     GrSLPrecision precision = kDefault_GrSLPrecision;
@@ -23,11 +25,9 @@ void GrGLSLVertexBuilder::transformToNormalizedDeviceSpace(const GrShaderVar& po
     }
 
     // setup RT Uniform
-    fProgramBuilder->fUniformHandles.fRTAdjustmentUni =
-            fProgramBuilder->addUniform(GrGLSLProgramBuilder::kVertex_Visibility,
-                                        kVec4f_GrSLType, precision,
-                                        fProgramBuilder->rtAdjustment(),
-                                        &fRtAdjustName);
+    uniformHandler->addRTAdjustmentUniform(precision,
+                                           fProgramBuilder->rtAdjustment(),
+                                           &fRtAdjustName);
     if (this->getProgramBuilder()->desc().header().fSnapVerticesToPixelCenters) {
         if (kVec3f_GrSLType == posVar.getType()) {
             const char* p = posVar.c_str();