[WIP] Worklet: Merge MainThreadWorklet and ThreadedWorklet into Worklet

third_party/WebKit/Source/modules/webaudio/AudioWorklet.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 AudioWorklet_h
 #define AudioWorklet_h
 
-#include "core/workers/ThreadedWorklet.h"
+#include "core/workers/Worklet.h"
 #include "modules/ModulesExport.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class LocalFrame;
-class ThreadedWorkletMessagingProxy;
 class WorkletGlobalScopeProxy;
 
-class MODULES_EXPORT AudioWorklet final : public ThreadedWorklet {
+class MODULES_EXPORT AudioWorklet final : public Worklet {
   WTF_MAKE_NONCOPYABLE(AudioWorklet);
 
  public:
   static AudioWorklet* Create(LocalFrame*);
   ~AudioWorklet() override;
 
-  void Initialize() final;
-  bool IsInitialized() const final;
-
-  WorkletGlobalScopeProxy* GetWorkletGlobalScopeProxy() const final;
-
   DECLARE_VIRTUAL_TRACE();
 
  private:
   explicit AudioWorklet(LocalFrame*);
 
-  // The proxy outlives the worklet as it is used to perform thread shutdown,
-  // it deletes itself once this has occurred.
-  ThreadedWorkletMessagingProxy* worklet_messaging_proxy_;
+  // Implements Worklet.
+  bool NeedsToCreateGlobalScope();
+  std::unique_ptr<WorkletGlobalScopeProxy> CreateGlobalScope();
 };
 
 }  // namespace blink
 
 #endif  // AudioWorklet_h