Create fragment processor for performing input color blend with child processor

src/effects/SkColorMatrixFilter.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColorMatrixFilter.h"
 #include "SkColorMatrix.h"
 #include "SkColorPriv.h"
@@ skipping 519 matching lines @@
 
 const GrFragmentProcessor* ColorMatrixEffect::TestCreate(GrProcessorTestData* d) {
     SkColorMatrix colorMatrix;
     for (size_t i = 0; i < SK_ARRAY_COUNT(colorMatrix.fMat); ++i) {
         colorMatrix.fMat[i] = d->fRandom->nextSScalar1();
     }
     return ColorMatrixEffect::Create(colorMatrix);
 }
 
 bool SkColorMatrixFilter::asFragmentProcessors(GrContext*, GrProcessorDataManager*,
-                                               SkTDArray<GrFragmentProcessor*>* array) const {
+                                               SkTDArray<const GrFragmentProcessor*>* array) const {
     GrFragmentProcessor* frag = ColorMatrixEffect::Create(fMatrix);
     if (frag) {
         if (array) {
             *array->append() = frag;
         } else {
             frag->unref();
             SkDEBUGCODE(frag = nullptr;)
         }
         return true;
     }
     return false;
 }
 
 #endif
 
 #ifndef SK_IGNORE_TO_STRING
 void SkColorMatrixFilter::toString(SkString* str) const {
     str->append("SkColorMatrixFilter: ");
 
     str->append("matrix: (");
     for (int i = 0; i < 20; ++i) {
         str->appendScalar(fMatrix.fMat[i]);
         if (i < 19) {
             str->append(", ");
         }
     }
     str->append(")");
 }
 #endif