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diff --git a/Source/WebCore/bindings/js/ReadableStreamDefaultController.h b/Source/WebCore/bindings/js/ReadableStreamDefaultController.h
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+++ b/Source/WebCore/bindings/js/ReadableStreamDefaultController.h
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+/*
+ * Copyright (C) 2016 Canon Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted, provided that the following conditions
+ * are required to be 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.
+ * 3.  Neither the name of Canon Inc. nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CANON 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 CANON INC. AND 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(READABLE_STREAM_API)
+
+#include "JSDOMConvertBufferSource.h"
+#include "JSReadableStreamDefaultController.h"
+#include <runtime/JSCJSValue.h>
+#include <runtime/JSCJSValueInlines.h>
+#include <runtime/TypedArrays.h>
+
+namespace WebCore {
+
+class ReadableStreamSource;
+
+class ReadableStreamDefaultController {
+public:
+    explicit ReadableStreamDefaultController(JSReadableStreamDefaultController* controller) : m_jsController(controller) { }
+
+    static JSC::JSValue invoke(JSC::ExecState&, JSC::JSObject&, const char*, JSC::JSValue);
+
+    bool enqueue(RefPtr<JSC::ArrayBuffer>&&);
+
+    template<class ResolveResultType>
+    void error(const ResolveResultType&);
+
+    void close() { invoke(*globalObject().globalExec(), jsController(), "close", JSC::jsUndefined()); }
+
+    bool isControlledReadableStreamLocked() const;
+
+private:
+    void error(JSC::ExecState& state, JSC::JSValue value) { invoke(state, jsController(), "error", value); }
+    void enqueue(JSC::ExecState& state, JSC::JSValue value) { invoke(state, jsController(), "enqueue", value); }
+    JSReadableStreamDefaultController& jsController() const;
+
+    JSDOMGlobalObject& globalObject() const;
+    JSC::ExecState& globalExec() const;
+
+    // The owner of ReadableStreamDefaultController is responsible to keep uncollected the JSReadableStreamDefaultController.
+    JSReadableStreamDefaultController* m_jsController { nullptr };
+};
+
+inline JSReadableStreamDefaultController& ReadableStreamDefaultController::jsController() const
+{
+    ASSERT(m_jsController);
+    return *m_jsController;
+}
+
+inline JSDOMGlobalObject& ReadableStreamDefaultController::globalObject() const
+{
+    ASSERT(m_jsController);
+    ASSERT(m_jsController->globalObject());
+    return *static_cast<JSDOMGlobalObject*>(m_jsController->globalObject());
+}
+
+inline JSC::ExecState& ReadableStreamDefaultController::globalExec() const
+{
+    ASSERT(globalObject().globalExec());
+    return *globalObject().globalExec();
+}
+
+inline bool ReadableStreamDefaultController::enqueue(RefPtr<JSC::ArrayBuffer>&& buffer)
+{
+    auto& globalObject = this->globalObject();
+    JSC::VM& vm = globalObject.vm();
+    JSC::JSLockHolder locker(vm);
+    auto scope = DECLARE_THROW_SCOPE(vm);
+    JSC::ExecState& state = globalExec();
+
+    if (!buffer) {
+        error(state, createOutOfMemoryError(&state));
+        return false;
+    }
+    auto length = buffer->byteLength();
+    auto chunk = JSC::Uint8Array::create(WTFMove(buffer), 0, length);
+    ASSERT(chunk);
+    enqueue(state, toJS(&state, &globalObject, chunk.get()));
+    ASSERT_UNUSED(scope, !scope.exception());
+    return true;
+}
+
+template<>
+inline void ReadableStreamDefaultController::error<String>(const String& errorMessage)
+{
+    JSC::ExecState& state = globalExec();
+    JSC::JSLockHolder locker(&state);
+    error(state, JSC::createTypeError(&state, errorMessage));
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(READABLE_STREAM_API)