Refactor GrGLUniformManager::UniformHandle to initialize itself by default

src/gpu/effects/GrConvolutionEffect.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 "GrConvolutionEffect.h"
 #include "gl/GrGLEffect.h"
 #include "gl/GrGLEffectMatrix.h"
 #include "gl/GrGLSL.h"
 #include "gl/GrGLTexture.h"
 #include "GrTBackendEffectFactory.h"
 
 // For brevity
 typedef GrGLUniformManager::UniformHandle UniformHandle;
-static const UniformHandle kInvalidUniformHandle = GrGLUniformManager::kInvalidUniformHandle;
 
 class GrGLConvolutionEffect : public GrGLEffect {
 public:
     GrGLConvolutionEffect(const GrBackendEffectFactory&, const GrDrawEffect&);
 
     virtual void emitCode(GrGLShaderBuilder*,
                           const GrDrawEffect&,
                           EffectKey,
                           const char* outputColor,
                           const char* inputColor,
@@ skipping 15 matching lines @@
     UniformHandle       fImageIncrementUni;
     UniformHandle       fBoundsUni;
     GrGLEffectMatrix    fEffectMatrix;
 
     typedef GrGLEffect INHERITED;
 };
 
 GrGLConvolutionEffect::GrGLConvolutionEffect(const GrBackendEffectFactory& factory,
                                              const GrDrawEffect& drawEffect)
     : INHERITED(factory)
-    , fKernelUni(kInvalidUniformHandle)
-    , fImageIncrementUni(kInvalidUniformHandle)
-    , fBoundsUni(kInvalidUniformHandle)
     , fEffectMatrix(drawEffect.castEffect<GrConvolutionEffect>().coordsType()) {
     const GrConvolutionEffect& c = drawEffect.castEffect<GrConvolutionEffect>();
     fRadius = c.radius();
     fUseBounds = c.useBounds();
     fDirection = c.direction();
 }
 
 void GrGLConvolutionEffect::emitCode(GrGLShaderBuilder* builder,
                                      const GrDrawEffect&,
                                      EffectKey key,
@@ skipping 175 matching lines @@
     }
 
     bool useBounds = random->nextBool();
     return GrConvolutionEffect::Create(textures[texIdx],
                                        dir,
                                        radius,
                                        kernel,
                                        useBounds,
                                        bounds);
 }