Make PromiseRejectCallback fire after end-of-turn.

src/api.cc

 // Copyright 2012 the V8 project 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 "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 5967 matching lines @@
       isolate,
       isolate->promise_then(),
       promise,
       arraysize(argv), argv,
       false).ToHandle(&result);
   EXCEPTION_BAILOUT_CHECK(isolate, Local<Promise>());
   return Local<Promise>::Cast(Utils::ToLocal(result));
 }
 
 
-bool Promise::HasHandler() {
-  i::Handle<i::JSObject> promise = Utils::OpenHandle(this);
-  i::Isolate* isolate = promise->GetIsolate();
-  LOG_API(isolate, "Promise::HasRejectHandler");
-  ENTER_V8(isolate);
-  i::Handle<i::Symbol> key = isolate->factory()->promise_has_handler_symbol();
-  return i::JSObject::GetDataProperty(promise, key)->IsTrue();
-}
-
-
 bool v8::ArrayBuffer::IsExternal() const {
   return Utils::OpenHandle(this)->is_external();
 }
 
 
 v8::ArrayBuffer::Contents v8::ArrayBuffer::Externalize() {
   i::Handle<i::JSArrayBuffer> obj = Utils::OpenHandle(this);
   Utils::ApiCheck(!obj->is_external(),
                   "v8::ArrayBuffer::Externalize",
                   "ArrayBuffer already externalized");
@@ skipping 1699 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal