Introduce PromiseRejectCallback.

src/runtime/runtime.cc

Index: src/runtime/runtime.cc
diff --git a/src/runtime/runtime.cc b/src/runtime/runtime.cc
index 427b8217456c165f4ba8884fbb689043bb76ccbd..01b08e99611490e8bdbdb9927c7826fae391986c 100644
--- a/src/runtime/runtime.cc
+++ b/src/runtime/runtime.cc
@@ -2657,16 +2657,42 @@ RUNTIME_FUNCTION(Runtime_DebugPromiseEvent) {
 }
 
 
-RUNTIME_FUNCTION(Runtime_DebugPromiseRejectEvent) {
-  DCHECK(args.length() == 2);
+RUNTIME_FUNCTION(Runtime_PromiseRejectEvent) {
+  DCHECK(args.length() == 3);
   HandleScope scope(isolate);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, promise, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
-  isolate->debug()->OnPromiseReject(promise, value);
+  CONVERT_BOOLEAN_ARG_CHECKED(debug_event, 2);
+  if (debug_event) isolate->debug()->OnPromiseReject(promise, value);
+  Handle<Symbol> key = isolate->factory()->promise_has_handler_symbol();
+  // Do not report if we actually have a handler.
+  if (JSObject::GetDataProperty(promise, key)->IsUndefined()) {
+    isolate->ReportPromiseReject(promise, value,
+                                 v8::kPromiseRejectWithNoHandler);
+  }
+  return isolate->heap()->undefined_value();
+}
+
+
+RUNTIME_FUNCTION(Runtime_PromiseRevokeReject) {
+  DCHECK(args.length() == 1);
+  HandleScope scope(isolate);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, promise, 0);
+  Handle<Symbol> key = isolate->factory()->promise_has_handler_symbol();
+  // At this point, no revocation has been issued before
+  RUNTIME_ASSERT(JSObject::GetDataProperty(promise, key)->IsUndefined());
+  isolate->ReportPromiseReject(promise, Handle<Object>(),
+                               v8::kPromiseHandlerAddedAfterReject);
   return isolate->heap()->undefined_value();
 }
 
 
+RUNTIME_FUNCTION(Runtime_PromiseHasHandlerSymbol) {
+  DCHECK(args.length() == 0);
+  return isolate->heap()->promise_has_handler_symbol();
+}
+
+
 RUNTIME_FUNCTION(Runtime_DebugAsyncTaskEvent) {
   DCHECK(args.length() == 1);
   HandleScope scope(isolate);