change colorfilter to return an array of frag processors

src/effects/SkLumaColorFilter.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 "SkLumaColorFilter.h"
 
 #include "SkColorPriv.h"
@@ skipping 101 matching lines @@
 
     bool onIsEqual(const GrFragmentProcessor&) const SK_OVERRIDE { return true; }
 
     void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_OVERRIDE {
         // The output is always black. The alpha value for the color passed in is arbitrary.
         inout->setToOther(kRGB_GrColorComponentFlags, GrColorPackRGBA(0, 0, 0, 0),
                           GrInvariantOutput::kWill_ReadInput);
     }
 };
 
-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