Rename GrGLUniformManager to GrGLUniform and ref GrGLUniforms directly

src/effects/gradients/SkSweepGradient.cpp

Index: src/effects/gradients/SkSweepGradient.cpp
diff --git a/src/effects/gradients/SkSweepGradient.cpp b/src/effects/gradients/SkSweepGradient.cpp
index f975a1887ead036816bd2f190fd36cb8f76a6c5e..d4f745319caa43a31fcc241ee45da8e4d1975831 100644
--- a/src/effects/gradients/SkSweepGradient.cpp
+++ b/src/effects/gradients/SkSweepGradient.cpp
@@ -472,12 +472,12 @@ void GrGLSweepGradient::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;
     t.printf("atan(- %s.y, - %s.x) * 0.1591549430918 + 0.5", coords, coords);
-    this->emitColorLookup(builder, t.c_str(), outputColor, inputColor, samplers[0]);
+    this->emitColorLookup(builder, yCoordUni, t.c_str(), outputColor, inputColor, samplers[0]);
 }
 
 /////////////////////////////////////////////////////////////////////