Create fragment processor for performing input color blend with child processor

src/core/SkColorFilter.cpp

Index: src/core/SkColorFilter.cpp
diff --git a/src/core/SkColorFilter.cpp b/src/core/SkColorFilter.cpp
index c67869fd65e2c163427d4543f01d64a427004728..4605a1d7ab8231c068d4fe48072b9ff81de4132c 100644
--- a/src/core/SkColorFilter.cpp
+++ b/src/core/SkColorFilter.cpp
@@ -68,7 +68,7 @@ public:
 
 #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;