Implement AudioWorkletProcessor interface

third_party/WebKit/Source/modules/webaudio/AudioWorkletProcessor.h

+// Copyright 2017 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 AudioWorkletProcessor_h
+#define AudioWorkletProcessor_h
+
+#include "bindings/core/v8/ScopedPersistent.h"
+#include "platform/heap/Handle.h"
+#include "v8/include/v8.h"
+
+namespace blink {
+
+class AudioBuffer;
+class AudioWorkletProcessorDefinition;
+
+// AudioWorkletProcessor class represents the active instance created from
+// AudioWorkletProcessorDefinition. |AudioWorkletNodeHandler| invokes
+// process() method in this object upon graph rendering.
+//
+// This is constructed and destroyed on a worker thread, and all methods also
+// must be called on the worker thread.
+class AudioWorkletProcessor
+    : public GarbageCollectedFinalized<AudioWorkletProcessor> {
+ public:
+  static AudioWorkletProcessor* create(AudioWorkletProcessorDefinition*);
+  virtual ~AudioWorkletProcessor();
+
+  // TODO(hongchan): This method is simplified for prototyping purpose.
+  bool process(AudioBuffer* inputBuffer, AudioBuffer* outputBuffer);
+
+  DECLARE_TRACE();
+
+ private:
+  explicit AudioWorkletProcessor(AudioWorkletProcessorDefinition*);
+
+  Member<AudioWorkletProcessorDefinition> m_definition;
+  ScopedPersistent<v8::Object> m_instance;
+};
+
+}  // namespace blink
+
+#endif  // AudioWorkletProcessor_h