Use wrapper tracing for worklets.

third_party/WebKit/Source/modules/csspaint/CSSPaintDefinition.cpp

 // Copyright 2016 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/csspaint/CSSPaintDefinition.h"
 
 #include "bindings/core/v8/V8BindingForCore.h"
 #include "core/css/CSSComputedStyleDeclaration.h"
 #include "core/css/cssom/FilteredComputedStylePropertyMap.h"
 #include "core/dom/ExecutionContext.h"
@@ skipping 37 matching lines @@
 
 CSSPaintDefinition::CSSPaintDefinition(
     ScriptState* script_state,
     v8::Local<v8::Function> constructor,
     v8::Local<v8::Function> paint,
     Vector<CSSPropertyID>& native_invalidation_properties,
     Vector<AtomicString>& custom_invalidation_properties,
     Vector<CSSSyntaxDescriptor>& input_argument_types,
     bool has_alpha)
     : script_state_(script_state),
-      constructor_(script_state->GetIsolate(), constructor),
-      paint_(script_state->GetIsolate(), paint),
+      constructor_(script_state->GetIsolate(), this, constructor),
+      paint_(script_state->GetIsolate(), this, paint),
+      instance_(this),
       did_call_constructor_(false),
       has_alpha_(has_alpha) {
   native_invalidation_properties_.swap(native_invalidation_properties);
   custom_invalidation_properties_.swap(custom_invalidation_properties);
   input_argument_types_.swap(input_argument_types);
 }
 
 CSSPaintDefinition::~CSSPaintDefinition() {}
 
 PassRefPtr<Image> CSSPaintDefinition::Paint(
@@ skipping 68 matching lines @@
 
   v8::Local<v8::Object> paint_instance;
   if (V8ObjectConstructor::NewInstance(isolate, constructor)
           .ToLocal(&paint_instance)) {
     instance_.Set(isolate, paint_instance);
   }
 
   did_call_constructor_ = true;
 }
 
+DEFINE_TRACE_WRAPPERS(CSSPaintDefinition) {
+  visitor->TraceWrappers(constructor_.Cast<v8::Value>());
+  visitor->TraceWrappers(paint_.Cast<v8::Value>());
+  visitor->TraceWrappers(instance_.Cast<v8::Value>());
+}
+
 }  // namespace blink