Send the pending input event ack before the UpdateRect message

content/browser/renderer_host/render_widget_host.cc

Index: content/browser/renderer_host/render_widget_host.cc
diff --git a/content/browser/renderer_host/render_widget_host.cc b/content/browser/renderer_host/render_widget_host.cc
index f006033c70433f0ed6365ca63cb2c188f76b2456..8ebe6acb02cc5416102fa6569933d83825bf898f 100644
--- a/content/browser/renderer_host/render_widget_host.cc
+++ b/content/browser/renderer_host/render_widget_host.cc
@@ -549,7 +549,8 @@ void RenderWidgetHost::StopHangMonitorTimeout() {
 }
 
 void RenderWidgetHost::ForwardMouseEvent(const WebMouseEvent& mouse_event) {
-  TRACE_EVENT0("renderer_host", "RenderWidgetHost::ForwardMouseEvent");
+  TRACE_EVENT2("renderer_host", "RenderWidgetHost::ForwardMouseEvent",
+               "x", mouse_event.x, "y", mouse_event.y);
   if (ignore_input_events_ || process_->IgnoreInputEvents())
     return;