Oilpan: Prepare to move HTMLResourcePreloader to Oilpan heap.

Source/core/html/parser/HTMLResourcePreloader.cpp

 /*
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 43 matching lines @@
     FetchInitiatorInfo initiatorInfo;
     initiatorInfo.name = AtomicString(m_initiatorName);
     initiatorInfo.position = m_initiatorPosition;
     FetchRequest request(ResourceRequest(completeURL(document)), initiatorInfo);
 
     if (m_isCORSEnabled)
         request.setCrossOriginAccessControl(document->securityOrigin(), m_allowCredentials);
     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;
     requests.swap(r);
 
     for (PreloadRequestStream::iterator it = requests.begin(); it != requests.end(); ++it)
         preload(it->release());
 }
 
 void HTMLResourcePreloader::preload(PassOwnPtr<PreloadRequest> preload)
 {
     FetchRequest request = preload->resourceRequest(m_document);
     blink::Platform::current()->histogramCustomCounts("WebCore.PreloadDelayMs", static_cast<int>(1000 * (monotonicallyIncreasingTime() - preload->discoveryTime())), 0, 2000, 20);
     m_document->fetcher()->preload(preload->resourceType(), request, preload->charset());
 }
 
 }