Implement color filter as GrGLEffect

src/effects/SkPerlinNoiseShader.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDither.h"
 #include "SkPerlinNoiseShader.h"
 #include "SkFlattenableBuffers.h"
@@ skipping 592 matching lines @@
       , fNumOctaves(numOctaves)
       , fStitchTiles(stitchTiles)
       , fMatrix(matrix)
       , fAlpha(alpha) {
         // This (1,1) translation is due to WebKit's 1 based coordinates for the noise
         // (as opposed to 0 based, usually). The same adjustment is in the shadeSpan() functions.
         SkMatrix m = matrix;
         m.postTranslate(SK_Scalar1, SK_Scalar1);
         fCoordTransform.reset(kLocal_GrCoordSet, m);
         this->addCoordTransform(&fCoordTransform);
+        this->setWillNotUseInputColor();
     }
 
     SkPerlinNoiseShader::Type       fType;
     GrCoordTransform                fCoordTransform;
     SkVector                        fBaseFrequency;
     int                             fNumOctaves;
     bool                            fStitchTiles;
     SkMatrix                        fMatrix;
     uint8_t                         fAlpha;
 
@@ skipping 743 matching lines @@
     str->append(" seed: ");
     str->appendScalar(fSeed);
     str->append(" stitch tiles: ");
     str->append(fStitchTiles ? "true " : "false ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif