Added addXSLStyleSheet and removeXSLStyleSheet to StyleEngine.

Source/core/dom/StyleEngine.h

Index: Source/core/dom/StyleEngine.h
diff --git a/Source/core/dom/StyleEngine.h b/Source/core/dom/StyleEngine.h
index d2a35e761a1581179da4254d66c82062a1800d56..e247ff3846811f64ba3c97e48e6d45e8923945ff 100644
--- a/Source/core/dom/StyleEngine.h
+++ b/Source/core/dom/StyleEngine.h
@@ -105,6 +105,8 @@ public:
     void removeStyleSheetCandidateNode(Node*);
     void removeStyleSheetCandidateNode(Node*, ContainerNode* scopingNode, TreeScope&);
     void modifiedStyleSheetCandidateNode(Node*);
+    void addXSLStyleSheet(Node*, bool createdByParser);
+    void removeXSLStyleSheet(Node*);
 
     void invalidateInjectedStyleSheetCache();
     void updateInjectedStyleSheetCache() const;
@@ -196,6 +198,7 @@ private:
     TreeScopeStyleSheetCollection* ensureStyleSheetCollectionFor(TreeScope&);
     TreeScopeStyleSheetCollection* styleSheetCollectionFor(TreeScope&);
     bool shouldUpdateShadowTreeStyleSheetCollection(StyleResolverUpdateMode);
+    bool shouldApplyXSLTransform() const;
 
     void markTreeScopeDirty(TreeScope&);
 
@@ -250,6 +253,8 @@ private:
 
     WillBeHeapHashMap<AtomicString, RawPtrWillBeMember<StyleSheetContents> > m_textToSheetCache;
     WillBeHeapHashMap<RawPtrWillBeMember<StyleSheetContents>, AtomicString> m_sheetToTextCache;
+
+    ProcessingInstruction* m_xslStyleSheet;

[esprehn, 2014/05/22 18:32:20]

This looks really scary, can this be a RefPtr instead?

[tasak, 2014/05/27 06:17:30]

Done.

 };
 
 }