Introduce MicrotasksCompletedCallback.

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 7442 matching lines @@
 void Isolate::SetAutorunMicrotasks(bool autorun) {
   reinterpret_cast<i::Isolate*>(this)->set_autorun_microtasks(autorun);
 }
 
 
 bool Isolate::WillAutorunMicrotasks() const {
   return reinterpret_cast<const i::Isolate*>(this)->autorun_microtasks();
 }
 
 
+void Isolate::AddMicrotasksCompletedCallback(
+    MicrotasksCompletedCallback callback) {
+  DCHECK(callback);
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  isolate->AddMicrotasksCompletedCallback(callback);
+}
+
+
+void Isolate::RemoveMicrotasksCompletedCallback(
+    MicrotasksCompletedCallback callback) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  isolate->RemoveMicrotasksCompletedCallback(callback);
+}
+
+
 void Isolate::SetUseCounterCallback(UseCounterCallback callback) {
   reinterpret_cast<i::Isolate*>(this)->SetUseCounterCallback(callback);
 }
 
 
 void Isolate::SetCounterFunction(CounterLookupCallback callback) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   isolate->stats_table()->SetCounterFunction(callback);
   isolate->InitializeLoggingAndCounters();
   isolate->counters()->ResetCounters();
@@ skipping 1118 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8