Create GLSLUniformHandler class for gpu backend

src/gpu/glsl/GrGLSLProgramBuilder.cpp

Index: src/gpu/glsl/GrGLSLProgramBuilder.cpp
diff --git a/src/gpu/glsl/GrGLSLProgramBuilder.cpp b/src/gpu/glsl/GrGLSLProgramBuilder.cpp
index 54e82b30c0a4c01638ae927ad6dfa5ff34ccea24..d3ed719fdc573d3d9b7ca50975db73fab0a761fe 100644
--- a/src/gpu/glsl/GrGLSLProgramBuilder.cpp
+++ b/src/gpu/glsl/GrGLSLProgramBuilder.cpp
@@ -34,6 +34,27 @@ void GrGLSLProgramBuilder::nameVariable(SkString* out, char prefix, const char*
 
 void GrGLSLProgramBuilder::appendUniformDecls(ShaderVisibility visibility,
                                               SkString* out) const {
-    this->onAppendUniformDecls(visibility, out);
+    this->uniformHandler()->appendUniformDecls(visibility, out);
+}
+
+void GrGLSLProgramBuilder::addRTAdjustmentUniform(GrSLPrecision precision,
+                                                  const char* name,
+                                                  const char** outName) {
+        SkASSERT(!fUniformHandles.fRTAdjustmentUni.isValid());
+        fUniformHandles.fRTAdjustmentUni =
+            this->uniformHandler()->addUniform(GrGLSLUniformHandler::kVertex_Visibility,
+                                               kVec4f_GrSLType,
+                                               precision,
+                                               name,
+                                               outName);
+}
+
+void GrGLSLProgramBuilder::addRTHeightUniform(const char* name, const char** outName) {
+        SkASSERT(!fUniformHandles.fRTHeightUni.isValid());
+        GrGLSLUniformHandler* uniformHandler = this->uniformHandler();
+        fUniformHandles.fRTHeightUni =
+            uniformHandler->internalAddUniformArray(GrGLSLUniformHandler::kFragment_Visibility,
+                                                    kFloat_GrSLType, kDefault_GrSLPrecision,
+                                                    name, false, 0, outName);
 }