Rename GrGLUniformManager to GrGLUniform and ref GrGLUniforms directly

src/effects/gradients/SkRadialGradient.cpp

Index: src/effects/gradients/SkRadialGradient.cpp
diff --git a/src/effects/gradients/SkRadialGradient.cpp b/src/effects/gradients/SkRadialGradient.cpp
index ca659699950f791935605bb50309ee4d3335aa8f..9507cdd42d21f2f92f1eb137a9c4a3747ab7c62c 100644
--- a/src/effects/gradients/SkRadialGradient.cpp
+++ b/src/effects/gradients/SkRadialGradient.cpp
@@ -558,13 +558,13 @@ void GrGLRadialGradient::emitCode(GrGLShaderBuilder* builder,
                                   const char* outputColor,
                                   const char* inputColor,
                                   const TextureSamplerArray& samplers) {
-    this->emitYCoordUniform(builder);
+    GrGLShaderBuilder::Uniform* yCoordUni = this->emitYCoordUniform(builder);
     const char* coords;
     this->setupMatrix(builder, key, &coords);
     SkString t("length(");
     t.append(coords);
     t.append(")");
-    this->emitColorLookup(builder, t.c_str(), outputColor, inputColor, samplers[0]);
+    this->emitColorLookup(builder, yCoordUni, t.c_str(), outputColor, inputColor, samplers[0]);
 }
 
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