Allow events in queue to coalesce while executing other events.

content/renderer/input/main_thread_event_queue_task_list.h

 // Copyright 2017 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 CONTENT_RENDERER_INPUT_MAIN_THREAD_EVENT_QUEUE_TASK_LIST_H_
 #define CONTENT_RENDERER_INPUT_MAIN_THREAD_EVENT_QUEUE_TASK_LIST_H_
 
 #include <deque>
 #include <memory>
 
@@ skipping 13 matching lines @@
   void Queue(std::unique_ptr<MainThreadEventQueueTask> event);
   std::unique_ptr<MainThreadEventQueueTask> Pop();
 
   const std::unique_ptr<MainThreadEventQueueTask>& front() const {
     return queue_.front();
   }
   const std::unique_ptr<MainThreadEventQueueTask>& at(size_t pos) const {
     return queue_.at(pos);
   }
 
-  void emplace_front(std::unique_ptr<MainThreadEventQueueTask> event) {
-    queue_.emplace_front(std::move(event));
-  }
-  void swap(std::deque<std::unique_ptr<MainThreadEventQueueTask>>* queue) {
-    queue_.swap(*queue);
-  }
-
   bool empty() const { return queue_.empty(); }
 
   size_t size() const { return queue_.size(); }
 
  private:
   typedef std::deque<std::unique_ptr<MainThreadEventQueueTask>> EventQueue;
   EventQueue queue_;
 
   DISALLOW_COPY_AND_ASSIGN(MainThreadEventQueueTaskList);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_INPUT_MAIN_THREAD_EVENT_QUEUE_TASK_LIST_H_