change colorfilter to return an array of frag processors

src/effects/SkLumaColorFilter.cpp

Index: src/effects/SkLumaColorFilter.cpp
diff --git a/src/effects/SkLumaColorFilter.cpp b/src/effects/SkLumaColorFilter.cpp
index 20e0659dfeff0625bc1787054fff2f9d34d22c6f..b7860e0a0b9a1848fb73b49debd972fb332b6d8a 100644
--- a/src/effects/SkLumaColorFilter.cpp
+++ b/src/effects/SkLumaColorFilter.cpp
@@ -119,7 +119,16 @@ private:
     }
 };
 
-GrFragmentProcessor* SkLumaColorFilter::asFragmentProcessor(GrContext*) const {
-    return LumaColorFilterEffect::Create();
+bool SkLumaColorFilter::asFragmentProcessors(GrContext*,
+                                             SkTDArray<GrFragmentProcessor*>* array) const {
+
+    GrFragmentProcessor* frag = LumaColorFilterEffect::Create();
+    if (frag) {
+        if (array) {
+            *array->append() = frag;
+        }
+        return true;
+    }
+    return false;
 }
 #endif