Revert of Added varying struct

src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp

Index: src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp
diff --git a/src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp b/src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp
index ff3989bf634bbd2c2d9b7bff924e6cdf18bd0c25..76558d8875fc9be54a772790a3c7bd87ff56c50c 100644
--- a/src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp
+++ b/src/gpu/gl/builders/GrGLFragmentShaderBuilder.cpp
@@ -346,10 +346,12 @@
     }
 }
 
-void GrGLFragmentShaderBuilder::addVarying(GrGLVarying* v, GrGLShaderVar::Precision fsPrec) {
-    v->fFsIn = v->fVsOut;
-    if (v->fGsOut) {
-        v->fFsIn = v->fGsOut;
-    }
-    fInputs.push_back().set(v->fType, GrGLShaderVar::kVaryingIn_TypeModifier, v->fFsIn, fsPrec);
-}
+void GrGLFragmentShaderBuilder::addVarying(GrSLType type,
+               const char* name,
+               const char** fsInName,
+               GrGLShaderVar::Precision fsPrecision) {
+    fInputs.push_back().set(type, GrGLShaderVar::kVaryingIn_TypeModifier, name, fsPrecision);
+    if (fsInName) {
+        *fsInName = name;
+    }
+}