Add a mojo channel for frame messages.

content/renderer/render_widget.cc

 // Copyright (c) 2012 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.
 
 #include "content/renderer/render_widget.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 821 matching lines @@
 }
 
 void RenderWidget::SendInputEventAck(blink::WebInputEvent::Type type,
                                      InputEventAckState ack_result,
                                      uint32_t touch_event_id) {
   InputEventAck ack(InputEventAckSource::MAIN_THREAD, type, ack_result,
                     touch_event_id);
   Send(new InputHostMsg_HandleInputEvent_ACK(routing_id_, ack));
 }
 
+scoped_refptr<MainThreadEventQueue> RenderWidget::GetInputEventQueue() {
+  return input_event_queue_;
+}
+
 void RenderWidget::OnCursorVisibilityChange(bool is_visible) {
   if (GetWebWidget())
     GetWebWidget()->SetCursorVisibilityState(is_visible);
 }
 
 void RenderWidget::OnMouseCaptureLost() {
   if (GetWebWidget())
     GetWebWidget()->MouseCaptureLost();
 }
 
@@ skipping 1489 matching lines @@
     // browser side (https://crbug.com/669219).
     // If there is no WebFrameWidget, then there will be no
     // InputMethodControllers for a WebLocalFrame.
     return nullptr;
   }
   return static_cast<blink::WebFrameWidget*>(GetWebWidget())
       ->GetActiveWebInputMethodController();
 }
 
 }  // namespace content