Return null when no promise/reason is given in PromiseRejectionEvent

Source/core/events/PromiseRejectionEvent.cpp

Index: Source/core/events/PromiseRejectionEvent.cpp
diff --git a/Source/core/events/PromiseRejectionEvent.cpp b/Source/core/events/PromiseRejectionEvent.cpp
index 2a4eb14da3e3e3f7db1e1889e116c6543a59e2ba..8f50096ead74ea8d8485189fa6fc5e633e3952da 100644
--- a/Source/core/events/PromiseRejectionEvent.cpp
+++ b/Source/core/events/PromiseRejectionEvent.cpp
@@ -12,8 +12,9 @@ PromiseRejectionEvent::PromiseRejectionEvent()
 {
 }
 
-PromiseRejectionEvent::PromiseRejectionEvent(const AtomicString& type, const PromiseRejectionEventInit& initializer)
+PromiseRejectionEvent::PromiseRejectionEvent(ScriptState* state, const AtomicString& type, const PromiseRejectionEventInit& initializer)
     : Event(type, initializer)
+    , m_scriptState(state)
 {
     if (initializer.hasPromise()) {
         m_promise.set(initializer.promise().isolate(), initializer.promise().v8Value());
@@ -29,16 +30,18 @@ PromiseRejectionEvent::~PromiseRejectionEvent()
 {
 }
 
-ScriptPromise PromiseRejectionEvent::promise(ScriptState* state) const
+ScriptPromise PromiseRejectionEvent::promise() const
 {
-    v8::Local<v8::Value> value = m_promise.newLocal(state->isolate());
-    return ScriptPromise(state, value);
+    if (!m_scriptState || !m_scriptState->contextIsValid())
+        return ScriptPromise();
+    return ScriptPromise(m_scriptState.get(), m_promise.newLocal(m_scriptState->isolate()));
 }
 
-ScriptValue PromiseRejectionEvent::reason(ScriptState* state) const
+ScriptValue PromiseRejectionEvent::reason() const
 {
-    v8::Local<v8::Value> value = m_reason.newLocal(state->isolate());
-    return ScriptValue(state, value);
+    if (!m_scriptState || !m_scriptState->contextIsValid())
+        return ScriptValue();
+    return ScriptValue(m_scriptState.get(), m_reason.newLocal(m_scriptState->isolate()));
 }
 
 const AtomicString& PromiseRejectionEvent::interfaceName() const