Merge ReferenceFilter into Filter

Source/core/paint/FilterEffectBuilder.cpp

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 56 matching lines @@
 
 DEFINE_TRACE(FilterEffectBuilder)
 {
     visitor->trace(m_lastEffect);
     visitor->trace(m_referenceFilters);
 }
 
 bool FilterEffectBuilder::build(Element* element, const FilterOperations& operations, float zoom)
 {
     // Create a parent filter for shorthand filters. These have already been scaled by the CSS code for page zoom, so scale is 1.0 here.
-    RefPtrWillBeRawPtr<ReferenceFilter> parentFilter = ReferenceFilter::create(1.0f);
-    RefPtrWillBeRawPtr<FilterEffect> previousEffect = SourceGraphic::create(parentFilter.get());
+    RefPtrWillBeRawPtr<Filter> parentFilter = Filter::create(1.0f);
+    RefPtrWillBeRawPtr<FilterEffect> previousEffect = parentFilter->sourceGraphic();
     for (size_t i = 0; i < operations.operations().size(); ++i) {
         RefPtrWillBeRawPtr<FilterEffect> effect = nullptr;
         FilterOperation* filterOperation = operations.operations().at(i).get();
         switch (filterOperation->type()) {
         case FilterOperation::REFERENCE: {
-            RefPtrWillBeRawPtr<ReferenceFilter> referenceFilter = ReferenceFilterBuilder::build(zoom, element, previousEffect.get(), toReferenceFilterOperation(*filterOperation));
+            RefPtrWillBeRawPtr<Filter> referenceFilter = ReferenceFilterBuilder::build(zoom, element, previousEffect.get(), toReferenceFilterOperation(*filterOperation));
             if (referenceFilter) {
                 effect = referenceFilter->lastEffect();
                 m_referenceFilters.append(referenceFilter);
             }
             break;
         }
         case FilterOperation::GRAYSCALE: {
             Vector<float> inputParameters;
             double oneMinusAmount = clampTo(1 - toBasicColorMatrixFilterOperation(filterOperation)->amount(), 0.0, 1.0);
 
@@ skipping 141 matching lines @@
 
     // If we didn't make any effects, tell our caller we are not valid
     if (!m_lastEffect.get())
         return false;
 
     return true;
 }
 
 } // namespace blink