Potentially optimize some GrGLEffects for known input color values

src/gpu/effects/GrSimpleTextureEffect.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 "GrSimpleTextureEffect.h"
 #include "gl/GrGLEffect.h"
 #include "gl/GrGLSL.h"
 #include "gl/GrGLTexture.h"
 #include "GrTBackendEffectFactory.h"
 #include "GrTexture.h"
 
 class GrGLSimpleTextureEffect : public GrGLEffect {
 public:
     GrGLSimpleTextureEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
         : INHERITED (factory) {
     }
 
     virtual void emitCode(GrGLShaderBuilder* builder,
                           const GrDrawEffect& drawEffect,
                           EffectKey key,
                           const char* outputColor,
-                          const char* inputColor,
+                          const GrGLSLExpr4& inputColor,
                           const TransformedCoordsArray& coords,
                           const TextureSamplerArray& samplers) SK_OVERRIDE {
         builder->fsCodeAppendf("\t%s = ", outputColor);
         builder->fsAppendTextureLookupAndModulate(inputColor,
                                                   samplers[0],
                                                   coords[0].c_str(),
                                                   coords[0].type());
         builder->fsCodeAppend(";\n");
     }
 
@@ skipping 35 matching lines @@
 
     static const GrCoordSet kCoordSets[] = {
         kLocal_GrCoordSet,
         kPosition_GrCoordSet
     };
     GrCoordSet coordSet = kCoordSets[random->nextULessThan(GR_ARRAY_COUNT(kCoordSets))];
 
     const SkMatrix& matrix = GrEffectUnitTest::TestMatrix(random);
     return GrSimpleTextureEffect::Create(textures[texIdx], matrix, coordSet);
 }