Oilpan: have PendingScripts trace their script elements.

Source/core/html/parser/HTMLDocumentParser.cpp

Index: Source/core/html/parser/HTMLDocumentParser.cpp
diff --git a/Source/core/html/parser/HTMLDocumentParser.cpp b/Source/core/html/parser/HTMLDocumentParser.cpp
index 20f5c4f44d18ec3e9105989a5f2161a94f952af2..d9d3af0fa40c1bddbe5609087120fa884bd50279 100644
--- a/Source/core/html/parser/HTMLDocumentParser.cpp
+++ b/Source/core/html/parser/HTMLDocumentParser.cpp
@@ -161,6 +161,15 @@ HTMLDocumentParser::~HTMLDocumentParser()
 void HTMLDocumentParser::trace(Visitor* visitor)
 {
     visitor->trace(m_treeBuilder);
+    // FIXME: Oilpan: m_scriptRunner is a traced OwnPtr. This is done
+    // so as to allow its destructor to refer to its 'host' (this
+    // HTMLDocumentParser object) when tidying up. Determine if there
+    // is a way to put HTMLScriptRunner on the heap while taking care
+    // of its finalization. It cannot be a part object, as
+    // m_scriptRunner isn't set for DocumentFragment parsing.
+    //
+    // See PendingScript::trace() comment for more background.
+    visitor->trace(m_scriptRunner);
     ScriptableDocumentParser::trace(visitor);
 }