Lazily generate HistoryItem's serialized form state

Source/core/loader/HistoryItem.cpp

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 #include "config.h"
 #include "core/loader/HistoryItem.h"
 
 #include "core/dom/Document.h"
+#include "core/html/forms/FormController.h"
 #include "platform/network/ResourceRequest.h"
 #include "wtf/CurrentTime.h"
 #include "wtf/text/CString.h"
 
 namespace WebCore {
 
 static long long generateSequenceNumber()
 {
     // Initialize to the current time to reduce the likelihood of generating
     // identifiers that overlap with those from past/future browser sessions.
@@ skipping 40 matching lines @@
 
 void HistoryItem::setURLString(const String& urlString)
 {
     if (m_urlString != urlString)
         m_urlString = urlString;
 }
 
 void HistoryItem::setURL(const KURL& url)
 {
     setURLString(url.string());
-    clearDocumentState();
 }
 
 void HistoryItem::setReferrer(const Referrer& referrer)
 {
     m_referrer = referrer;
 }
 
 void HistoryItem::setTarget(const String& target)
 {
     m_target = target;
@@ skipping 20 matching lines @@
     return m_pageScaleFactor;
 }
 
 void HistoryItem::setPageScaleFactor(float scaleFactor)
 {
     m_pageScaleFactor = scaleFactor;
 }
 
 void HistoryItem::setDocumentState(const Vector<String>& state)
 {
+    ASSERT(!m_documentState);
+    m_documentStateVector = state;
+}
+
+void HistoryItem::setDocumentState(DocumentState* state)
+{
     m_documentState = state;
 }
 
-const Vector<String>& HistoryItem::documentState() const
+const Vector<String>& HistoryItem::documentState()
 {
-    return m_documentState;
+    if (m_documentState)
+        m_documentStateVector = m_documentState->toStateVector();
+    return m_documentStateVector;
+}
+
+Vector<String> HistoryItem::getReferencedFilePaths()
+{
+    return FormController::getReferencedFilePaths(documentState());
 }
 
 void HistoryItem::clearDocumentState()
 {
     m_documentState.clear();
+    m_documentStateVector.clear();
 }
 
 void HistoryItem::setStateObject(PassRefPtr<SerializedScriptValue> object)
 {
     m_stateObject = object;
 }
 
 void HistoryItem::deprecatedAddChildItem(PassRefPtr<HistoryItem> child)
 {
     m_children.append(child);
@@ skipping 43 matching lines @@
 }
 
 bool HistoryItem::isCurrentDocument(Document* doc) const
 {
     // FIXME: We should find a better way to check if this is the current document.
     return equalIgnoringFragmentIdentifier(url(), doc->url());
 }
 
 } // namespace WebCore