CSP blocks style application in cloned nodes

Source/WebCore/dom/Element.h

Index: Source/WebCore/dom/Element.h
diff --git a/Source/WebCore/dom/Element.h b/Source/WebCore/dom/Element.h
index cd6d014399bdb13ec61adb69140ec3163f9bbe30..4186604712fbd9ed4bb9c2dd2ce1f33efb4f76f7 100644
--- a/Source/WebCore/dom/Element.h
+++ b/Source/WebCore/dom/Element.h
@@ -372,8 +372,13 @@ public:
     // For exposing to DOM only.
     NamedNodeMap* attributes() const;
 
+    enum AttributeModificationReason {
+        ModifiedDirectly,
+        ModifiedByCloning
+    };
+
     // This method is called whenever an attribute is added, changed or removed.
-    virtual void attributeChanged(const QualifiedName&, const AtomicString&);
+    virtual void attributeChanged(const QualifiedName&, const AtomicString&, AttributeModificationReason = ModifiedDirectly);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) { }
 
     // Only called by the parser immediately after element construction.
@@ -677,7 +682,7 @@ private:
     void setAttributeInternal(size_t index, const QualifiedName&, const AtomicString& value, SynchronizationOfLazyAttribute);
     void addAttributeInternal(const QualifiedName&, const AtomicString& value, SynchronizationOfLazyAttribute);
     void removeAttributeInternal(size_t index, SynchronizationOfLazyAttribute);
-    void attributeChangedFromParserOrByCloning(const QualifiedName&, const AtomicString&);
+    void attributeChangedFromParserOrByCloning(const QualifiedName&, const AtomicString&, AttributeModificationReason);
 
 #ifndef NDEBUG
     virtual void formatForDebugger(char* buffer, unsigned length) const;