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diff --git a/Source/WebKit2/UIProcess/API/APIUserContentExtensionStore.h b/Source/WebKit2/UIProcess/API/APIUserContentExtensionStore.h
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+++ b/Source/WebKit2/UIProcess/API/APIUserContentExtensionStore.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 APIUserContentExtensionStore_h
+#define APIUserContentExtensionStore_h
+
+#if ENABLE(CONTENT_EXTENSIONS)
+
+#include "APIObject.h"
+#include <system_error>
+#include <wtf/text/WTFString.h>
+
+namespace WTF {
+class WorkQueue;
+}
+
+namespace API {
+
+class UserContentExtension;
+
+class UserContentExtensionStore final : public ObjectImpl<Object::Type::UserContentExtensionStore> {
+public:
+    enum class Error {
+        LookupFailed = 1,
+        VersionMismatch,
+        CompileFailed,
+        RemoveFailed
+    };
+    
+    // This should be incremented every time a functional change is made to the bytecode, file format, etc.
+    // to prevent crashing while loading old data.
+    const static uint32_t CurrentContentExtensionFileVersion = 7;
+
+    static UserContentExtensionStore& defaultStore();
+    static Ref<UserContentExtensionStore> storeWithPath(const WTF::String& storePath);
+
+    explicit UserContentExtensionStore();
+    explicit UserContentExtensionStore(const WTF::String& storePath);
+    virtual ~UserContentExtensionStore();
+
+    void compileContentExtension(const WTF::String& identifier, WTF::String&& json, std::function<void(RefPtr<API::UserContentExtension>, std::error_code)>);
+    void lookupContentExtension(const WTF::String& identifier, std::function<void(RefPtr<API::UserContentExtension>, std::error_code)>);
+    void removeContentExtension(const WTF::String& identifier, std::function<void(std::error_code)>);
+
+    // For testing only.
+    void synchronousRemoveAllContentExtensions();
+
+private:
+    WTF::String defaultStorePath();
+
+    const WTF::String m_storePath;
+    Ref<WTF::WorkQueue> m_compileQueue;
+    Ref<WTF::WorkQueue> m_readQueue;
+    Ref<WTF::WorkQueue> m_removeQueue;
+};
+
+const std::error_category& userContentExtensionStoreErrorCategory();
+
+inline std::error_code make_error_code(UserContentExtensionStore::Error error)
+{
+    return { static_cast<int>(error), userContentExtensionStoreErrorCategory() };
+}
+
+} // namespace API
+
+namespace std {
+    template<> struct is_error_code_enum<API::UserContentExtensionStore::Error> : public true_type { };
+}
+
+#endif // ENABLE(CONTENT_EXTENSIONS)
+#endif // APIUserContentExtensionStore_h