Oilpan: have PendingScripts trace their script elements.

Source/core/html/parser/HTMLScriptRunner.h

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 #ifndef HTMLScriptRunner_h
 #define HTMLScriptRunner_h
 
 #include "core/dom/PendingScript.h"
+#include "platform/heap/Handle.h"
 #include "wtf/Deque.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/TextPosition.h"
 
 namespace WebCore {
 
 class Resource;
 class ScriptResource;
 class Document;
 class Element;
 class LocalFrame;
 class HTMLScriptRunnerHost;
 class ScriptSourceCode;
 
-class HTMLScriptRunner {
+class HTMLScriptRunner FINAL {
     WTF_MAKE_NONCOPYABLE(HTMLScriptRunner); WTF_MAKE_FAST_ALLOCATED;
 public:
     static PassOwnPtr<HTMLScriptRunner> create(Document* document, HTMLScriptRunnerHost* host)
     {
         return adoptPtr(new HTMLScriptRunner(document, host));
     }
     ~HTMLScriptRunner();
 
     void detach();
 
     // Processes the passed in script and any pending scripts if possible.
-    void execute(PassRefPtr<Element> scriptToProcess, const TextPosition& scriptStartPosition);
+    void execute(PassRefPtrWillBeRawPtr<Element> scriptToProcess, const TextPosition& scriptStartPosition);
 
     void executeScriptsWaitingForLoad(Resource*);
     bool hasScriptsWaitingForResources() const { return m_hasScriptsWaitingForResources; }
     void executeScriptsWaitingForResources();
     bool executeScriptsWaitingForParsing();
 
     bool hasParserBlockingScript() const;
     bool isExecutingScript() const { return !!m_scriptNestingLevel; }
 
+    void trace(Visitor*);
+
 private:
     HTMLScriptRunner(Document*, HTMLScriptRunnerHost*);
 
     LocalFrame* frame() const;
 
     enum PendingScriptType {
         PendingScriptBlockingParser,
         PendingScriptDeferred
     };
 
@@ skipping 22 matching lines @@
     // We only want stylesheet loads to trigger script execution if script
     // execution is currently stopped due to stylesheet loads, otherwise we'd
     // cause nested script execution when parsing <style> tags since </style>
     // tags can cause Document to call executeScriptsWaitingForResources.
     bool m_hasScriptsWaitingForResources;
 };
 
 }
 
 #endif