Create fragment processor for performing input color blend with child processor

src/core/SkColorFilter.cpp

 /*
  * Copyright 2006 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 "SkColorFilter.h"
 #include "SkReadBuffer.h"
 #include "SkRefCnt.h"
@@ skipping 50 matching lines @@
     void toString(SkString* str) const override {
         SkString outerS, innerS;
         fOuter->toString(&outerS);
         fInner->toString(&innerS);
         str->appendf("SkComposeColorFilter: outer(%s) inner(%s)", outerS.c_str(), innerS.c_str());
     }
 #endif
 
 #if SK_SUPPORT_GPU
     bool asFragmentProcessors(GrContext* context, GrProcessorDataManager* procDataManager,
-                              SkTDArray<GrFragmentProcessor*>* array) const override {
+                              SkTDArray<const GrFragmentProcessor*>* array) const override {
         bool hasFrags = fInner->asFragmentProcessors(context, procDataManager, array);
         hasFrags |= fOuter->asFragmentProcessors(context, procDataManager, array);
         return hasFrags;
     }
 #endif
 
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkComposeColorFilter)
     
 protected:
     void flatten(SkWriteBuffer& buffer) const override {
@@ skipping 50 matching lines @@
     if (count > SK_MAX_COMPOSE_COLORFILTER_COUNT) {
         return nullptr;
     }
     return new SkComposeColorFilter(outer, inner, count);
 }
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkColorFilter)
 SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkComposeColorFilter)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END