Change the non-blocking event queue to the main thread event queue.

content/renderer/mus/render_widget_mus_connection.cc

Index: content/renderer/mus/render_widget_mus_connection.cc
diff --git a/content/renderer/mus/render_widget_mus_connection.cc b/content/renderer/mus/render_widget_mus_connection.cc
index b4eec0c592528fe5944f29d0cd4655b3eac35842..e0f1c74989cd8ef48a46c6bd67ea53452acdcefc 100644
--- a/content/renderer/mus/render_widget_mus_connection.cc
+++ b/content/renderer/mus/render_widget_mus_connection.cc
@@ -130,7 +130,7 @@ void RenderWidgetMusConnection::OnInputEventAck(
   pending_ack_.Reset();
 }
 
-void RenderWidgetMusConnection::NonBlockingInputEventHandled(
+void RenderWidgetMusConnection::NotifyInputEventHandled(
     blink::WebInputEvent::Type handled_type) {
   NOTIMPLEMENTED();
 }
@@ -184,7 +184,7 @@ void RenderWidgetMusConnection::OnWindowInputEvent(
   // TODO(fsamuel, sadrul): Track real latency info.
   ui::LatencyInfo latency_info;
   input_handler_->HandleInputEvent(*input_event, latency_info,
-                                   DISPATCH_TYPE_NORMAL);
+                                   DISPATCH_TYPE_BLOCKING);
 }
 
 }  // namespace content