Oilpan: turn StyleResourceLoader into a traced part object.

Source/core/css/resolver/StyleResourceLoader.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 28 matching lines @@
 #include "core/layout/style/StylePendingImage.h"
 #include "core/layout/svg/ReferenceFilterBuilder.h"
 
 namespace blink {
 
 StyleResourceLoader::StyleResourceLoader(Document* document)
     : m_document(document)
 {
 }
 
+DEFINE_TRACE(StyleResourceLoader)
+{
+    visitor->trace(m_document);
+}
+
 void StyleResourceLoader::loadPendingSVGDocuments(LayoutStyle* layoutStyle, ElementStyleResources& elementStyleResources)
 {
     if (!layoutStyle->hasFilter() || elementStyleResources.pendingSVGDocuments().isEmpty())
         return;
 
     FilterOperations::FilterOperationVector& filterOperations = layoutStyle->mutableFilter().operations();
     for (unsigned i = 0; i < filterOperations.size(); ++i) {
         RefPtrWillBeRawPtr<FilterOperation> filterOperation = filterOperations.at(i);
         if (filterOperation->type() == FilterOperation::REFERENCE) {
             ReferenceFilterOperation* referenceFilter = toReferenceFilterOperation(filterOperation.get());
@@ skipping 144 matching lines @@
 void StyleResourceLoader::loadPendingResources(LayoutStyle* layoutStyle, ElementStyleResources& elementStyleResources)
 {
     // Start loading images referenced by this style.
     loadPendingImages(layoutStyle, elementStyleResources);
 
     // Start loading the SVG Documents referenced by this style.
     loadPendingSVGDocuments(layoutStyle, elementStyleResources);
 }
 
 }