Refactor GrGLUniformManager::UniformHandle to initialize itself by default

src/gpu/effects/GrTextureDomainEffect.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrTextureDomainEffect.h"
 #include "GrSimpleTextureEffect.h"
 #include "GrTBackendEffectFactory.h"
@@ skipping 20 matching lines @@
     GrGLUniformManager::UniformHandle fNameUni;
     GrGLEffectMatrix                  fEffectMatrix;
     GrGLfloat                         fPrevDomain[4];
 
     typedef GrGLEffect INHERITED;
 };
 
 GrGLTextureDomainEffect::GrGLTextureDomainEffect(const GrBackendEffectFactory& factory,
                                                  const GrDrawEffect& drawEffect)
     : INHERITED(factory)
-    , fNameUni(GrGLUniformManager::kInvalidUniformHandle)
     , fEffectMatrix(drawEffect.castEffect<GrTextureDomainEffect>().coordsType()) {
     fPrevDomain[0] = SK_FloatNaN;
 }
 
 void GrGLTextureDomainEffect::emitCode(GrGLShaderBuilder* builder,
                                        const GrDrawEffect& drawEffect,
                                        EffectKey key,
                                        const char* outputColor,
                                        const char* inputColor,
                                        const TextureSamplerArray& samplers) {
@@ skipping 183 matching lines @@
     const SkMatrix& matrix = GrEffectUnitTest::TestMatrix(random);
     bool bilerp = random->nextBool();
     CoordsType coords = random->nextBool() ? kLocal_CoordsType : kPosition_CoordsType;
     return GrTextureDomainEffect::Create(textures[texIdx],
                                          matrix,
                                          domain,
                                          wrapMode,
                                          bilerp ? GrTextureParams::kBilerp_FilterMode : GrTextureParams::kNone_FilterMode,
                                          coords);
 }