[wrapper-tracing] Trace CustomElementReactionStack

third_party/WebKit/Source/core/dom/custom/CustomElementReactionStack.h

Index: third_party/WebKit/Source/core/dom/custom/CustomElementReactionStack.h
diff --git a/third_party/WebKit/Source/core/dom/custom/CustomElementReactionStack.h b/third_party/WebKit/Source/core/dom/custom/CustomElementReactionStack.h
index 8245eef949fa69965dedd0fb142e1e42eb5b1b48..b4f51f48275306d94c3089e112d16ef3d668af25 100644
--- a/third_party/WebKit/Source/core/dom/custom/CustomElementReactionStack.h
+++ b/third_party/WebKit/Source/core/dom/custom/CustomElementReactionStack.h
@@ -5,6 +5,7 @@
 #ifndef CustomElementReactionStack_h
 #define CustomElementReactionStack_h
 
+#include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Noncopyable.h"
@@ -17,13 +18,15 @@ class Element;
 
 // https://html.spec.whatwg.org/multipage/scripting.html#custom-element-reactions
 class CORE_EXPORT CustomElementReactionStack final
-    : public GarbageCollected<CustomElementReactionStack> {
+    : public GarbageCollected<CustomElementReactionStack>,
+      public TraceWrapperBase {
   WTF_MAKE_NONCOPYABLE(CustomElementReactionStack);
 
  public:
   CustomElementReactionStack();
 
   DECLARE_TRACE();
+  DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
   void push();
   void popInvokingReactions();
@@ -37,7 +40,8 @@ class CORE_EXPORT CustomElementReactionStack final
   friend class CustomElementReactionStackTestSupport;
 
   using ElementReactionQueueMap =
-      HeapHashMap<Member<Element>, Member<CustomElementReactionQueue>>;
+      HeapHashMap<TraceWrapperMember<Element>,
+                  Member<CustomElementReactionQueue>>;
   ElementReactionQueueMap m_map;
 
   using ElementQueue = HeapVector<Member<Element>, 1>;