[worklets] Add AudioWorkletGlobalScope and AudioWorkletThread

third_party/WebKit/Source/modules/webaudio/AudioWorkletGlobalScope.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 AudioWorkletGlobalScope_h
+#define AudioWorkletGlobalScope_h
+
+#include "core/workers/ThreadedWorkletGlobalScope.h"
+
+namespace blink {
+
+class AudioWorkletGlobalScope final : public ThreadedWorkletGlobalScope {
+  DEFINE_WRAPPERTYPEINFO();
+
+ public:
+  static AudioWorkletGlobalScope* create(const KURL&,
+                                         const String& userAgent,
+                                         PassRefPtr<SecurityOrigin>,
+                                         v8::Isolate*,
+                                         WorkerThread*);
+  ~AudioWorkletGlobalScope() override;
+
+ private:
+  AudioWorkletGlobalScope(const KURL&,
+                          const String& userAgent,
+                          PassRefPtr<SecurityOrigin>,
+                          v8::Isolate*,
+                          WorkerThread*);
+};
+
+}  // namespace blink
+
+#endif  // AudioWorkletGlobalScope_h