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diff --git a/Source/WebCore/contentextensions/ContentExtension.h b/Source/WebCore/contentextensions/ContentExtension.h
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+++ b/Source/WebCore/contentextensions/ContentExtension.h
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+/*
+ * Copyright (C) 2015 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef ContentExtension_h
+#define ContentExtension_h
+
+#include <wtf/Ref.h>
+#include <wtf/RefCounted.h>
+#include <wtf/RefPtr.h>
+
+#if ENABLE(CONTENT_EXTENSIONS)
+
+#include "DFABytecodeInterpreter.h"
+#include "StyleSheetContents.h"
+
+namespace WebCore {
+
+namespace ContentExtensions {
+
+class CompiledContentExtension;
+
+class ContentExtension : public RefCounted<ContentExtension> {
+public:
+    static RefPtr<ContentExtension> create(const String& identifier, Ref<CompiledContentExtension>&&);
+
+    const String& identifier() const { return m_identifier; }
+    const CompiledContentExtension& compiledExtension() const { return m_compiledExtension.get(); }
+    StyleSheetContents* globalDisplayNoneStyleSheet();
+    const DFABytecodeInterpreter::Actions& cachedDomainActions(const String& domain);
+    const Vector<uint32_t>& universalActionsWithoutDomains() { return m_universalActionsWithoutDomains; }
+    const Vector<uint32_t>& universalActionsWithDomains(const String& domain);
+
+private:
+    ContentExtension(const String& identifier, Ref<CompiledContentExtension>&&);
+    uint32_t findFirstIgnorePreviousRules() const;
+    
+    String m_identifier;
+    Ref<CompiledContentExtension> m_compiledExtension;
+
+    RefPtr<StyleSheetContents> m_globalDisplayNoneStyleSheet;
+    void compileGlobalDisplayNoneStyleSheet();
+
+    String m_cachedDomain;
+    void populateDomainCacheIfNeeded(const String& domain);
+    DFABytecodeInterpreter::Actions m_cachedDomainActions;
+    Vector<uint32_t> m_cachedUniversalDomainActions;
+
+    Vector<uint32_t> m_universalActionsWithoutDomains;
+    Vector<uint64_t> m_universalActionsWithDomains;
+};
+
+} // namespace ContentExtensions
+} // namespace WebCore
+
+#endif // ENABLE(CONTENT_EXTENSIONS)
+#endif // ContentExtension_h