Scale the emulated event in EventSender when use-zoom-for-dsf is enabled

components/test_runner/event_sender.h

Index: components/test_runner/event_sender.h
diff --git a/components/test_runner/event_sender.h b/components/test_runner/event_sender.h
index 20c10ed063743613834d170cf9e0993c3d11910f..4f77fcf47a98f080b9dff305a14f36f2b95c5457 100644
--- a/components/test_runner/event_sender.h
+++ b/components/test_runner/event_sender.h
@@ -205,6 +205,9 @@ class EventSender {
   void SendGesturesForMouseWheelEvent(
       const blink::WebMouseWheelEvent wheel_event);
 
+  std::unique_ptr<blink::WebInputEvent> ScaleEvent(
+      const blink::WebInputEvent& event);
+
   double last_event_timestamp() { return last_event_timestamp_; }
 
   bool force_layout_on_events() const { return force_layout_on_events_; }