Oilpan: have PendingScripts trace their script elements.

Source/core/html/parser/HTMLScriptRunner.cpp

 /*
  * Copyright (C) 2010 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 124 matching lines @@
         Microtask::performCheckpoint();
         if (pendingScriptType == PendingScriptBlockingParser) {
             m_hasScriptsWaitingForResources = !m_document->isScriptExecutionReady();
             // The parser cannot be unblocked as a microtask requested another resource
             if (m_hasScriptsWaitingForResources)
                 return;
         }
     }
 
     // Clear the pending script before possible rentrancy from executeScript()
-    RefPtr<Element> element = pendingScript.releaseElementAndClear();
+    RefPtrWillBeRawPtr<Element> element = pendingScript.releaseElementAndClear();
     if (ScriptLoader* scriptLoader = toScriptLoaderIfPossible(element.get())) {
         NestingLevelIncrementer nestingLevelIncrementer(m_scriptNestingLevel);
         IgnoreDestructiveWriteCountIncrementer ignoreDestructiveWriteCountIncrementer(m_document);
         if (errorOccurred)
             scriptLoader->dispatchErrorEvent();
         else {
             ASSERT(isExecutingScript());
             scriptLoader->executeScript(sourceCode);
             element->dispatchEvent(createScriptLoadEvent());
         }
@@ skipping 11 matching lines @@
 void HTMLScriptRunner::stopWatchingForLoad(PendingScript& pendingScript)
 {
     ASSERT(pendingScript.watchingForLoad());
     m_host->stopWatchingForLoad(pendingScript.resource());
     pendingScript.setWatchingForLoad(false);
 }
 
 // Implements the steps for 'An end tag whose tag name is "script"'
 // http://whatwg.org/html#scriptEndTag
 // Script handling lives outside the tree builder to keep each class simple.
-void HTMLScriptRunner::execute(PassRefPtr<Element> scriptElement, const TextPosition& scriptStartPosition)
+void HTMLScriptRunner::execute(PassRefPtrWillBeRawPtr<Element> scriptElement, const TextPosition& scriptStartPosition)
 {
     ASSERT(scriptElement);
     // FIXME: If scripting is disabled, always just return.
 
     bool hadPreloadScanner = m_host->hasPreloadScanner();
 
     // Try to execute the script given to us.
     runScript(scriptElement.get(), scriptStartPosition);
 
     if (hasParserBlockingScript()) {
@@ skipping 133 matching lines @@
             } else {
                 ScriptSourceCode sourceCode(script->textContent(), documentURLForScriptExecution(m_document), scriptStartPosition);
                 scriptLoader->executeScript(sourceCode);
             }
         } else {
             requestParsingBlockingScript(script);
         }
     }
 }
 
+void HTMLScriptRunner::trace(Visitor* visitor)
+{
+    visitor->trace(m_parserBlockingScript);
+    visitor->trace(m_scriptsToExecuteAfterParsing);
 }
+
+}