Oilpan: have PendingScripts trace their script elements.

Source/core/html/parser/HTMLScriptRunner.cpp

Index: Source/core/html/parser/HTMLScriptRunner.cpp
diff --git a/Source/core/html/parser/HTMLScriptRunner.cpp b/Source/core/html/parser/HTMLScriptRunner.cpp
index 91e008b4ca370d5714c448ded81c215f60c1d77e..4713e575efedb0f622dfe92139886590491fac5e 100644
--- a/Source/core/html/parser/HTMLScriptRunner.cpp
+++ b/Source/core/html/parser/HTMLScriptRunner.cpp
@@ -142,7 +142,7 @@ void HTMLScriptRunner::executePendingScriptAndDispatchEvent(PendingScript& pendi
     }
 
     // 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);
@@ -174,7 +174,7 @@ void HTMLScriptRunner::stopWatchingForLoad(PendingScript& pendingScript)
 // 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.
@@ -328,4 +328,10 @@ void HTMLScriptRunner::runScript(Element* script, const TextPosition& scriptStar
     }
 }
 
+void HTMLScriptRunner::trace(Visitor* visitor)
+{
+    visitor->trace(m_parserBlockingScript);
+    visitor->trace(m_scriptsToExecuteAfterParsing);
+}
+
 }