[wrapper-tracing] Support for incrementally tracing ScopedPersistent

third_party/WebKit/Source/core/events/PromiseRejectionEvent.cpp

Index: third_party/WebKit/Source/core/events/PromiseRejectionEvent.cpp
diff --git a/third_party/WebKit/Source/core/events/PromiseRejectionEvent.cpp b/third_party/WebKit/Source/core/events/PromiseRejectionEvent.cpp
index e0d7a937ea9539fb9f415b16bf2dcb232853dd8f..781eb432473beeb9e50576c9eeeaef9c403b923f 100644
--- a/third_party/WebKit/Source/core/events/PromiseRejectionEvent.cpp
+++ b/third_party/WebKit/Source/core/events/PromiseRejectionEvent.cpp
@@ -12,7 +12,10 @@ PromiseRejectionEvent::PromiseRejectionEvent(
     ScriptState* state,
     const AtomicString& type,
     const PromiseRejectionEventInit& initializer)
-    : Event(type, initializer), m_scriptState(state) {
+    : Event(type, initializer),
+      m_scriptState(state),
+      m_promise(this),
+      m_reason(this) {
   ThreadState::current()->registerPreFinalizer(this);
   DCHECK(initializer.hasPromise());
   m_promise.set(initializer.promise().isolate(),