Ensure acks are sent for all blocking events.

content/renderer/mus/render_widget_mus_connection.h

Index: content/renderer/mus/render_widget_mus_connection.h
diff --git a/content/renderer/mus/render_widget_mus_connection.h b/content/renderer/mus/render_widget_mus_connection.h
index d3142348f8c6a200a2c8e61d165935827bb3ddb0..bb0abe34a344e964858c75582bf256bfc6c47a70 100644
--- a/content/renderer/mus/render_widget_mus_connection.h
+++ b/content/renderer/mus/render_widget_mus_connection.h
@@ -49,8 +49,8 @@ class CONTENT_EXPORT RenderWidgetMusConnection
   void OnDidHandleKeyEvent() override;
   void OnDidOverscroll(const DidOverscrollParams& params) override;
   void OnInputEventAck(std::unique_ptr<InputEventAck> input_event_ack) override;
-  void NotifyInputEventHandled(
-      blink::WebInputEvent::Type handled_type) override;
+  void NotifyInputEventHandled(blink::WebInputEvent::Type handled_type,
+                               InputEventAckState ack_result) override;
   void SetInputHandler(RenderWidgetInputHandler* input_handler) override;
   void UpdateTextInputState(ShowIme show_ime,
                             ChangeSource change_source) override;