Use wrapper tracing for worklets.

third_party/WebKit/Source/modules/compositorworker/AnimatorDefinition.cpp

Index: third_party/WebKit/Source/modules/compositorworker/AnimatorDefinition.cpp
diff --git a/third_party/WebKit/Source/modules/compositorworker/AnimatorDefinition.cpp b/third_party/WebKit/Source/modules/compositorworker/AnimatorDefinition.cpp
index 225d14b74fd2bf915c44838c4d42fbaf58f60d87..b36aa1f5a7efa83741bff01ff002d00ec2dba252 100644
--- a/third_party/WebKit/Source/modules/compositorworker/AnimatorDefinition.cpp
+++ b/third_party/WebKit/Source/modules/compositorworker/AnimatorDefinition.cpp
@@ -15,10 +15,16 @@ namespace blink {
 AnimatorDefinition::AnimatorDefinition(v8::Isolate* isolate,
                                        v8::Local<v8::Function> constructor,
                                        v8::Local<v8::Function> animate)
-    : constructor_(isolate, constructor), animate_(isolate, animate) {}
+    : constructor_(isolate, this, constructor),
+      animate_(isolate, this, animate) {}
 
 AnimatorDefinition::~AnimatorDefinition() {}
 
+DEFINE_TRACE_WRAPPERS(AnimatorDefinition) {
+  visitor->TraceWrappers(constructor_.Cast<v8::Value>());
+  visitor->TraceWrappers(animate_.Cast<v8::Value>());
+}
+
 v8::Local<v8::Function> AnimatorDefinition::ConstructorLocal(
     v8::Isolate* isolate) {
   return constructor_.NewLocal(isolate);