Rename GrGLUniformManager to GrGLUniform and ref GrGLUniforms directly

src/effects/gradients/SkLinearGradient.cpp

Index: src/effects/gradients/SkLinearGradient.cpp
diff --git a/src/effects/gradients/SkLinearGradient.cpp b/src/effects/gradients/SkLinearGradient.cpp
index 2f56cb49ca21c2b4443663a5259def64bf31f24d..20ab788cc09b9cd1c87dd1a2e5184281e73cbc27 100644
--- a/src/effects/gradients/SkLinearGradient.cpp
+++ b/src/effects/gradients/SkLinearGradient.cpp
@@ -524,13 +524,13 @@ void GrGLLinearGradient::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.append(coords);
     t.append(".x");
-    this->emitColorLookup(builder, t.c_str(), outputColor, inputColor, samplers[0]);
+    this->emitColorLookup(builder, yCoordUni, t.c_str(), outputColor, inputColor, samplers[0]);
 }
 
 /////////////////////////////////////////////////////////////////////