Refactor GrGLUniformManager::UniformHandle to initialize itself by default

src/effects/SkMorphologyImageFilter.cpp

 /*
  * Copyright 2012 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 "SkMorphologyImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 294 matching lines @@
     GrMorphologyEffect::MorphologyType  fType;
     GrGLUniformManager::UniformHandle   fImageIncrementUni;
     GrGLEffectMatrix                    fEffectMatrix;
 
     typedef GrGLEffect INHERITED;
 };
 
 GrGLMorphologyEffect::GrGLMorphologyEffect(const GrBackendEffectFactory& factory,
                                            const GrDrawEffect& drawEffect)
     : INHERITED(factory)
-    , fImageIncrementUni(GrGLUniformManager::kInvalidUniformHandle)
     , fEffectMatrix(drawEffect.castEffect<GrMorphologyEffect>().coordsType()) {
     const GrMorphologyEffect& m = drawEffect.castEffect<GrMorphologyEffect>();
     fRadius = m.radius();
     fType = m.type();
 }
 
 void GrGLMorphologyEffect::emitCode(GrGLShaderBuilder* builder,
                                     const GrDrawEffect&,
                                     EffectKey key,
                                     const char* outputColor,
@@ skipping 198 matching lines @@
     }
     GrTexture* input = inputBM.getTexture();
     SkIRect bounds;
     src.getBounds(&bounds);
     SkAutoTUnref<GrTexture> resultTex(apply_morphology(input, bounds,
         GrMorphologyEffect::kErode_MorphologyType, radius()));
     return SkImageFilterUtils::WrapTexture(resultTex, src.width(), src.height(), result);
 }
 
 #endif