Introduce debug events for Microtask queue.

src/debug.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/v8.h"
 
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 2533 matching lines @@
 }
 
 
 MaybeHandle<Object> Debug::MakePromiseEvent(Handle<JSObject> event_data) {
   // Create the promise event object.
   Handle<Object> argv[] = { event_data };
   return MakeJSObject("MakePromiseEvent", ARRAY_SIZE(argv), argv);
 }
 
 
+MaybeHandle<Object> Debug::MakeAsyncTaskEvent(Handle<JSObject> task_event) {
+  // Create the async task event object.
+  Handle<Object> argv[] = { task_event };
+  return MakeJSObject("MakeAsyncTaskEvent", ARRAY_SIZE(argv), argv);
+}
+
+
 void Debug::OnException(Handle<Object> exception, bool uncaught) {
   if (in_debug_scope() || ignore_events()) return;
 
   HandleScope scope(isolate_);
   Handle<Object> promise = GetPromiseForUncaughtException();
   uncaught |= !promise->IsUndefined();
 
   // Bail out if exception breaks are not active
   if (uncaught) {
     // Uncaught exceptions are reported by either flags.
@@ skipping 144 matching lines @@
   // Bail out and don't call debugger if exception.
   if (!MakePromiseEvent(data).ToHandle(&event_data)) return;
 
   // Process debug event.
   ProcessDebugEvent(v8::PromiseEvent,
                     Handle<JSObject>::cast(event_data),
                     true);
 }
 
 
+void Debug::OnAsyncTaskEvent(Handle<JSObject> data) {
+  if (in_debug_scope() || ignore_events()) return;
+
+  HandleScope scope(isolate_);
+  DebugScope debug_scope(this);
+  if (debug_scope.failed()) return;
+
+  // Create the script collected state object.
+  Handle<Object> event_data;
+  // Bail out and don't call debugger if exception.
+  if (!MakeAsyncTaskEvent(data).ToHandle(&event_data)) return;
+
+  // Process debug event.
+  ProcessDebugEvent(v8::AsyncTaskEvent,
+                    Handle<JSObject>::cast(event_data),
+                    true);
+}
+
+
 void Debug::ProcessDebugEvent(v8::DebugEvent event,
                               Handle<JSObject> event_data,
                               bool auto_continue) {
   HandleScope scope(isolate_);
 
   // Create the execution state.
   Handle<Object> exec_state;
   // Bail out and don't call debugger if exception.
   if (!MakeExecutionState().ToHandle(&exec_state)) return;
 
@@ skipping 642 matching lines @@
   logger_->DebugEvent("Put", message.text());
 }
 
 
 void LockingCommandMessageQueue::Clear() {
   base::LockGuard<base::Mutex> lock_guard(&mutex_);
   queue_.Clear();
 }
 
 } }  // namespace v8::internal