Use wrapper tracing for worklets.

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

Index: third_party/WebKit/Source/modules/webaudio/AudioWorkletProcessorDefinition.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/AudioWorkletProcessorDefinition.cpp b/third_party/WebKit/Source/modules/webaudio/AudioWorkletProcessorDefinition.cpp
index b055c2ff894e3fc73a3b8206364c57f2ceac70a7..e6a6d051899908b87d0ecf4aee7f60b0bf473c7b 100644
--- a/third_party/WebKit/Source/modules/webaudio/AudioWorkletProcessorDefinition.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/AudioWorkletProcessorDefinition.cpp
@@ -22,8 +22,8 @@ AudioWorkletProcessorDefinition::AudioWorkletProcessorDefinition(
     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() {}
 
@@ -39,4 +39,9 @@ v8::Local<v8::Function> AudioWorkletProcessorDefinition::ProcessLocal(
   return process_.NewLocal(isolate);
 }
 
+DEFINE_TRACE_WRAPPERS(AudioWorkletProcessorDefinition) {
+  visitor->TraceWrappers(constructor_.Cast<v8::Value>());
+  visitor->TraceWrappers(process_.Cast<v8::Value>());
+}
+
 }  // namespace blink