Revert of Remove scoped styles.

Source/core/html/HTMLStyleElement.h

Index: Source/core/html/HTMLStyleElement.h
diff --git a/Source/core/html/HTMLStyleElement.h b/Source/core/html/HTMLStyleElement.h
index 71da210804cb506bc01be038a0d0be595d755faf..d7ddd8843691774c169127de43be427b4f2a88d1 100644
--- a/Source/core/html/HTMLStyleElement.h
+++ b/Source/core/html/HTMLStyleElement.h
@@ -42,7 +42,22 @@
 
     void setType(const AtomicString&);
 
+    bool scoped() const;
+    void setScoped(bool);
     ContainerNode* scopingNode();
+    bool isRegisteredAsScoped() const
+    {
+        // Note: We cannot rely on the 'scoped' attribute still being present when this method is invoked.
+        // Therefore we cannot rely on scoped()!
+        if (m_scopedStyleRegistrationState == NotRegistered)
+            return false;
+        return true;
+    }
+
+    bool isRegisteredInShadowRoot() const
+    {
+        return m_scopedStyleRegistrationState == RegisteredInShadowRoot;
+    }
 
     using StyleElement::sheet;
 
@@ -73,8 +88,19 @@
     virtual const AtomicString& media() const OVERRIDE;
     virtual const AtomicString& type() const OVERRIDE;
 
+    void scopedAttributeChanged(bool);
+    void registerWithScopingNode(bool);
+    void unregisterWithScopingNode(ContainerNode*);
+
     bool m_firedLoad;
     bool m_loadedSheet;
+
+    enum ScopedStyleRegistrationState {
+        NotRegistered,
+        RegisteredAsScoped,
+        RegisteredInShadowRoot
+    };
+    ScopedStyleRegistrationState m_scopedStyleRegistrationState;
 };
 
 } //namespace