Teach main thread event queue about closures.

content/renderer/input/input_event_filter.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 CONTENT_RENDERER_INPUT_INPUT_EVENT_FILTER_H_
 #define CONTENT_RENDERER_INPUT_INPUT_EVENT_FILTER_H_
 
 #include <queue>
 #include <set>
 #include <unordered_map>
@@ skipping 45 matching lines @@
   // If INPUT_EVENT_ACK_STATE_NOT_CONSUMED is returned by the handler,
   // the original InputMsg_HandleInputEvent message will be delivered to
   // |main_listener| on the main thread.  (The "main thread" in this context is
   // the thread where the InputEventFilter was constructed.)  The responsibility
   // is left to the eventual handler to deliver the corresponding
   // InputHostMsg_HandleInputEvent_ACK.
   //
   void SetInputHandlerManager(InputHandlerManager*) override;
   void RegisterRoutingID(int routing_id) override;
   void UnregisterRoutingID(int routing_id) override;
+  void QueueClosureForMainThreadEventQueue(
+      int routing_id,
+      const base::Closure& closure) override;
   void DidOverscroll(int routing_id,
                      const ui::DidOverscrollParams& params) override;
   void DidStopFlinging(int routing_id) override;
   void DispatchNonBlockingEventToMainThread(
       int routing_id,
       ui::WebScopedInputEvent event,
       const ui::LatencyInfo& latency_info) override;
 
   void NotifyInputEventHandled(int routing_id,
                                blink::WebInputEvent::Type type,
@@ skipping 59 matching lines @@
   using RouteQueueMap =
       std::unordered_map<int, scoped_refptr<MainThreadEventQueue>>;
   RouteQueueMap route_queues_;
 
   blink::scheduler::RendererScheduler* renderer_scheduler_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_INPUT_INPUT_EVENT_FILTER_H_