Oilpan: Prepare to move HTMLResourcePreloader to Oilpan heap.

Source/core/html/parser/HTMLResourcePreloader.cpp

Index: Source/core/html/parser/HTMLResourcePreloader.cpp
diff --git a/Source/core/html/parser/HTMLResourcePreloader.cpp b/Source/core/html/parser/HTMLResourcePreloader.cpp
index 768576271412324d8be479b122f610df86ef2abf..9b0738d3e94a360b1a879986092b4bd534659e64 100644
--- a/Source/core/html/parser/HTMLResourcePreloader.cpp
+++ b/Source/core/html/parser/HTMLResourcePreloader.cpp
@@ -61,6 +61,21 @@ FetchRequest PreloadRequest::resourceRequest(Document* document)
     return request;
 }
 
+inline HTMLResourcePreloader::HTMLResourcePreloader(Document& document)
+    : m_document(document)
+{
+}
+
+PassOwnPtrWillBeRawPtr<HTMLResourcePreloader> HTMLResourcePreloader::create(Document& document)
+{
+    return adoptPtrWillBeNoop(new HTMLResourcePreloader(document));
+}
+
+void HTMLResourcePreloader::trace(Visitor* visitor)
+{
+    visitor->trace(m_document);
+}
+
 void HTMLResourcePreloader::takeAndPreload(PreloadRequestStream& r)
 {
     PreloadRequestStream requests;