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diff --git a/deps/v8/src/objects/microtask-queue.h b/deps/v8/src/objects/microtask-queue.h
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+++ b/deps/v8/src/objects/microtask-queue.h
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+// Copyright 2018 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_OBJECTS_MICROTASK_QUEUE_H_
+#define V8_OBJECTS_MICROTASK_QUEUE_H_
+
+#include "src/objects.h"
+#include "src/objects/microtask.h"
+
+// Has to be the last include (doesn't have include guards):
+#include "src/objects/object-macros.h"
+
+namespace v8 {
+namespace internal {
+
+class V8_EXPORT_PRIVATE MicrotaskQueue : public Struct {
+ public:
+  DECL_CAST(MicrotaskQueue)
+  DECL_VERIFIER(MicrotaskQueue)
+  DECL_PRINTER(MicrotaskQueue)
+
+  // A FixedArray that the queued microtasks are stored.
+  // The first |pending_microtask_count| slots contains Microtask instance
+  // for each, and followings are undefined_value if any.
+  DECL_ACCESSORS(queue, FixedArray)
+
+  // The number of microtasks queued in |queue|. This must be less or equal to
+  // the length of |queue|.
+  DECL_INT_ACCESSORS(pending_microtask_count)
+
+  // Enqueues |microtask| to |microtask_queue|.
+  static void EnqueueMicrotask(Isolate* isolate,
+                               Handle<MicrotaskQueue> microtask_queue,
+                               Handle<Microtask> microtask);
+
+  // Runs all enqueued microtasks.
+  static void RunMicrotasks(Handle<MicrotaskQueue> microtask_queue);
+
+  static constexpr int kMinimumQueueCapacity = 8;
+
+  static const int kQueueOffset = HeapObject::kHeaderSize;
+  static const int kPendingMicrotaskCountOffset = kQueueOffset + kPointerSize;
+  static const int kSize = kPendingMicrotaskCountOffset + kPointerSize;
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(MicrotaskQueue);
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#include "src/objects/object-macros-undef.h"
+
+#endif  // V8_OBJECTS_MICROTASK_QUEUE_H_