Use wrapper tracing for worklets.

third_party/WebKit/Source/modules/webaudio/AudioWorkletProcessorDefinition.cpp

 // 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.
 
 #include "modules/webaudio/AudioWorkletProcessorDefinition.h"
 
 namespace blink {
 
 AudioWorkletProcessorDefinition* AudioWorkletProcessorDefinition::Create(
     v8::Isolate* isolate,
     const String& name,
     v8::Local<v8::Function> constructor,
     v8::Local<v8::Function> process) {
   DCHECK(!IsMainThread());
   return new AudioWorkletProcessorDefinition(isolate, name, constructor,
                                              process);
 }
 
 AudioWorkletProcessorDefinition::AudioWorkletProcessorDefinition(
     v8::Isolate* isolate,
     const String& name,
     v8::Local<v8::Function> constructor,
     v8::Local<v8::Function> process)
     : name_(name),
-      constructor_(isolate, constructor),
-      process_(isolate, process) {}
+      constructor_(isolate, this, constructor),
+      process_(isolate, this, process) {}
 
 AudioWorkletProcessorDefinition::~AudioWorkletProcessorDefinition() {}
 
 v8::Local<v8::Function> AudioWorkletProcessorDefinition::ConstructorLocal(
     v8::Isolate* isolate) {
   DCHECK(!IsMainThread());
   return constructor_.NewLocal(isolate);
 }
 
 v8::Local<v8::Function> AudioWorkletProcessorDefinition::ProcessLocal(
     v8::Isolate* isolate) {
   DCHECK(!IsMainThread());
   return process_.NewLocal(isolate);
 }
 
+DEFINE_TRACE_WRAPPERS(AudioWorkletProcessorDefinition) {
+  visitor->TraceWrappers(constructor_.Cast<v8::Value>());
+  visitor->TraceWrappers(process_.Cast<v8::Value>());
+}
+
 }  // namespace blink