Implement AudioWorkletProcessor interface

third_party/WebKit/Source/modules/webaudio/AudioWorkletProcessorDefinition.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 AudioWorkletProcessorDefinition_h
+#define AudioWorkletProcessorDefinition_h
+
+#include "bindings/core/v8/ScopedPersistent.h"
+#include "modules/ModulesExport.h"
+#include "platform/heap/Handle.h"
+#include "v8/include/v8.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+// Represents a JavaScript class definition registered in the
+// AudioWorkletGlobalScope. After the registration, a definition class contains
+// the V8 representation of class components (constructor, process callback,
+// prototypes and parameter descriptors).
+//
+// This is constructed and destroyed on a worker thread, and all methods also
+// must be called on the worker thread.
+class MODULES_EXPORT AudioWorkletProcessorDefinition final
+    : public GarbageCollectedFinalized<AudioWorkletProcessorDefinition> {
+ public:
+  static AudioWorkletProcessorDefinition* create(
+      v8::Isolate*,
+      const String& name,
+      v8::Local<v8::Function> constructor,
+      v8::Local<v8::Function> process);
+
+  virtual ~AudioWorkletProcessorDefinition();
+
+  const String& name() const { return m_name; }
+  v8::Local<v8::Function> constructorLocal(v8::Isolate*);
+  v8::Local<v8::Function> processLocal(v8::Isolate*);
+
+  DEFINE_INLINE_TRACE(){};
+
+ private:
+  AudioWorkletProcessorDefinition(v8::Isolate*,
+                                  const String& name,
+                                  v8::Local<v8::Function> constructor,
+                                  v8::Local<v8::Function> process);
+
+  const String m_name;
+
+  // The definition is per global scope. The active instance of
+  // |AudioProcessorWorklet| should be passed into these to perform JS function.
+  ScopedPersistent<v8::Function> m_constructor;
+  ScopedPersistent<v8::Function> m_process;
+
+  // TODO(hongchan): A container for AudioParamDescriptor objects.
+  // ScopedPersistent<v8::Array> m_parameterDescriptors;
+};
+
+}  // namespace blink
+
+#endif  // AudioWorkletProcessorDefinition_h