Update from https://crrev.com/308331

base/message_loop/incoming_task_queue.h

 // Copyright 2013 The Chromium 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 BASE_MESSAGE_LOOP_INCOMING_TASK_QUEUE_H_
 #define BASE_MESSAGE_LOOP_INCOMING_TASK_QUEUE_H_
 
 #include "base/base_export.h"
 #include "base/memory/ref_counted.h"
 #include "base/pending_task.h"
@@ skipping 66 matching lines @@
   // on this instance's thread. These tasks have not yet been been pushed to
   // |message_loop_|.
   TaskQueue incoming_queue_;
 
   // Points to the message loop that owns |this|.
   MessageLoop* message_loop_;
 
   // The next sequence number to use for delayed tasks.
   int next_sequence_num_;
 
+  // True if our message loop has already been scheduled and does not need to be
+  // scheduled again until an empty reload occurs.
+  bool message_loop_scheduled_;
+
+  // True if we always need to call ScheduleWork when receiving a new task, even
+  // if the incoming queue was not empty.
+  const bool always_schedule_work_;
+
   DISALLOW_COPY_AND_ASSIGN(IncomingTaskQueue);
 };
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_MESSAGE_LOOP_INCOMING_TASK_QUEUE_H_