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diff --git a/Source/WebCore/dom/LoadableScript.h b/Source/WebCore/dom/LoadableScript.h
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+++ b/Source/WebCore/dom/LoadableScript.h
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+/*
+ * Copyright (C) 2016 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. ``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
+ * 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
+
+#include "ScriptElementCachedScriptFetcher.h"
+#include <runtime/ConsoleTypes.h>
+#include <wtf/HashCountedSet.h>
+#include <wtf/RefCounted.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+class LoadableScriptClient;
+class ScriptElement;
+
+class LoadableScript : public ScriptElementCachedScriptFetcher {
+public:
+    enum class ErrorType {
+        CachedScript,
+        CrossOriginLoad,
+        Nosniff,
+    };
+
+    struct ConsoleMessage {
+        MessageSource source;
+        MessageLevel level;
+        String message;
+    };
+
+    struct Error {
+        ErrorType type;
+        std::optional<ConsoleMessage> consoleMessage;
+    };
+
+    virtual ~LoadableScript() { }
+
+    virtual bool isLoaded() const = 0;
+    virtual std::optional<Error> error() const = 0;
+    virtual bool wasCanceled() const = 0;
+
+    virtual void execute(ScriptElement&) = 0;
+
+    void addClient(LoadableScriptClient&);
+    void removeClient(LoadableScriptClient&);
+
+protected:
+    LoadableScript(const String& nonce, const String& crossOriginMode, const String& charset, const AtomicString& initiatorName, bool isInUserAgentShadowTree)
+        : ScriptElementCachedScriptFetcher(nonce, crossOriginMode, charset, initiatorName, isInUserAgentShadowTree)
+    {
+    }
+
+    void notifyClientFinished();
+
+private:
+    HashCountedSet<LoadableScriptClient*> m_clients;
+};
+
+}