Implement empty WorkerInternals interface.

third_party/WebKit/Source/core/testing/WorkerInternals.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef WorkerInternals_h
+#define WorkerInternals_h
+
+#include "bindings/core/v8/ScriptState.h"
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "platform/heap/GarbageCollected.h"
+
+namespace blink {
+
+class WorkerInternals final : public GarbageCollectedFinalized<WorkerInternals>, public ScriptWrappable {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static WorkerInternals* create(ScriptState*);
+    virtual ~WorkerInternals();
+
+    DEFINE_INLINE_TRACE() {}
+private:
+    explicit WorkerInternals(ScriptState*);
+};
+
+} // namespace blink
+
+#endif // WorkerInternals_h