Introduce debug events for Microtask queue.

src/runtime.h

 // 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.
 
 #ifndef V8_RUNTIME_H_
 #define V8_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/zone.h"
 
@@ skipping 60 matching lines @@
   F(UnblockConcurrentRecompilation, 0, 1) \
   F(CompileForOnStackReplacement, 1, 1) \
   F(SetAllocationTimeout, -1 /* 2 || 3 */, 1) \
   F(SetNativeFlag, 1, 1) \
   F(SetInlineBuiltinFlag, 1, 1) \
   F(StoreArrayLiteralElement, 5, 1) \
   F(DebugPrepareStepInIfStepping, 1, 1) \
   F(DebugPromiseHandlePrologue, 1, 1) \
   F(DebugPromiseHandleEpilogue, 0, 1) \
   F(DebugPromiseEvent, 1, 1) \
+  F(DebugAsyncTaskEvent, 1, 1) \
   F(FlattenString, 1, 1) \
   F(LoadMutableDouble, 2, 1) \
   F(TryMigrateInstance, 1, 1) \
   F(NotifyContextDisposed, 0, 1) \
   \
   /* Array join support */ \
   F(PushIfAbsent, 2, 1) \
   F(ArrayConcat, 1, 1) \
   \
   /* Conversions */ \
@@ skipping 798 matching lines @@
 class AllocateDoubleAlignFlag:  public BitField<bool,            0, 1> {};
 class AllocateTargetSpace:      public BitField<AllocationSpace, 1, 3> {};
 
 class DeclareGlobalsEvalFlag:   public BitField<bool,       0, 1> {};
 class DeclareGlobalsNativeFlag: public BitField<bool,       1, 1> {};
 class DeclareGlobalsStrictMode: public BitField<StrictMode, 2, 1> {};
 
 } }  // namespace v8::internal
 
 #endif  // V8_RUNTIME_H_