Refactor GrGLUniformManager::UniformHandle to initialize itself by default

src/effects/gradients/SkGradientShader.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGradientShaderPriv.h"
 #include "SkLinearGradient.h"
 #include "SkRadialGradient.h"
@@ skipping 808 matching lines @@
 
 #if SK_SUPPORT_GPU
 
 #include "effects/GrTextureStripAtlas.h"
 #include "GrTBackendEffectFactory.h"
 #include "SkGr.h"
 
 GrGLGradientEffect::GrGLGradientEffect(const GrBackendEffectFactory& factory)
     : INHERITED(factory)
     , fCachedYCoord(SK_ScalarMax)
-    , fFSYUni(GrGLUniformManager::kInvalidUniformHandle)
     , fEffectMatrix(kCoordsType) {
 }
 
 GrGLGradientEffect::~GrGLGradientEffect() { }
 
 void GrGLGradientEffect::emitYCoordUniform(GrGLShaderBuilder* builder) {
     fFSYUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
                                   kFloat_GrSLType, "GradientYCoordFS");
 }
 
@@ skipping 137 matching lines @@
             (*stops)[i] = stop;
             stop = i < outColors - 1 ? stop + random->nextUScalar1() * (1.f - stop) : 1.f;
         }
     }
     *tm = static_cast<SkShader::TileMode>(random->nextULessThan(SkShader::kTileModeCount));
 
     return outColors;
 }
 
 #endif