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diff --git a/Source/WebCore/contentextensions/ContentExtensionCompiler.h b/Source/WebCore/contentextensions/ContentExtensionCompiler.h
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+++ b/Source/WebCore/contentextensions/ContentExtensionCompiler.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.
+ */
+
+#pragma once
+
+#if ENABLE(CONTENT_EXTENSIONS)
+
+#include "CompiledContentExtension.h"
+#include <system_error>
+#include <wtf/Forward.h>
+#include <wtf/Ref.h>
+
+namespace WebCore {
+namespace ContentExtensions {
+
+class ContentExtensionCompilationClient {
+public:
+    virtual ~ContentExtensionCompilationClient() { }
+    
+    // Functions should be called in this order. All except writeActions and finalize can be called multiple times, though.
+    virtual void writeActions(Vector<SerializedActionByte>&&) = 0;
+    virtual void writeFiltersWithoutDomainsBytecode(Vector<DFABytecode>&&) = 0;
+    virtual void writeFiltersWithDomainsBytecode(Vector<DFABytecode>&&) = 0;
+    virtual void writeDomainFiltersBytecode(Vector<DFABytecode>&&) = 0;
+    virtual void finalize() = 0;
+};
+
+WEBCORE_EXPORT std::error_code compileRuleList(ContentExtensionCompilationClient&, String&&);
+
+} // namespace ContentExtensions
+} // namespace WebCore
+
+#endif // ENABLE(CONTENT_EXTENSIONS)