Oilpan: move SVG property hierarchy to the heap.

Source/core/rendering/FilterEffectRenderer.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 58 matching lines @@
 }
 
 FilterEffectRenderer::FilterEffectRenderer()
 {
 }
 
 FilterEffectRenderer::~FilterEffectRenderer()
 {
 }
 
+void FilterEffectRenderer::trace(Visitor* visitor)
+{
+    visitor->trace(m_lastEffect);
+    visitor->trace(m_referenceFilters);
+}
+
 bool FilterEffectRenderer::build(RenderObject* renderer, const FilterOperations& operations)
 {
     const RenderStyle* style = renderer->style();
     float zoom = style ? style->effectiveZoom() : 1.0f;
 
     // 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.
-    RefPtr<ReferenceFilter> parentFilter = ReferenceFilter::create(1.0f);
-    RefPtr<FilterEffect> previousEffect = SourceGraphic::create(parentFilter.get());
+    RefPtrWillBeRawPtr<ReferenceFilter> parentFilter = ReferenceFilter::create(1.0f);
+    RefPtrWillBeRawPtr<FilterEffect> previousEffect = SourceGraphic::create(parentFilter.get());
     for (size_t i = 0; i < operations.operations().size(); ++i) {
-        RefPtr<FilterEffect> effect;
+        RefPtrWillBeRawPtr<FilterEffect> effect = nullptr;
         FilterOperation* filterOperation = operations.operations().at(i).get();
         switch (filterOperation->type()) {
         case FilterOperation::REFERENCE: {
-            RefPtr<ReferenceFilter> referenceFilter = ReferenceFilter::create(zoom);
+            RefPtrWillBeRawPtr<ReferenceFilter> referenceFilter = ReferenceFilter::create(zoom);
             effect = ReferenceFilterBuilder::build(referenceFilter.get(), renderer, previousEffect.get(), toReferenceFilterOperation(filterOperation));
             referenceFilter->setLastEffect(effect);
             m_referenceFilters.append(referenceFilter);
             break;
         }
         case FilterOperation::GRAYSCALE: {
             Vector<float> inputParameters;
             double oneMinusAmount = clampTo(1 - toBasicColorMatrixFilterOperation(filterOperation)->amount(), 0.0, 1.0);
 
             // See https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#grayscaleEquivalent
@@ skipping 168 matching lines @@
 }
 
 void FilterEffectRenderer::endFilterEffect(GraphicsContext* context)
 {
     context->endLayer();
     context->restore();
 }
 
 } // namespace blink