linux_aura: Improve window drag performance.

ui/views/widget/desktop_aura/desktop_screen_x11.cc

Index: ui/views/widget/desktop_aura/desktop_screen_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_screen_x11.cc b/ui/views/widget/desktop_aura/desktop_screen_x11.cc
index c54378e1857ba7a2baf59ae8aa5ab07a5fd24a22..7b99790e4ada1ec08d000fa58006f99435d7c342 100644
--- a/ui/views/widget/desktop_aura/desktop_screen_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_screen_x11.cc
@@ -10,6 +10,7 @@
 // It clashes with out RootWindow.
 #undef RootWindow
 
+#include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/x11/edid_parser_x11.h"
 #include "ui/aura/root_window.h"
@@ -132,6 +133,8 @@ bool DesktopScreenX11::IsDIPEnabled() {
 }
 
 gfx::Point DesktopScreenX11::GetCursorScreenPoint() {
+  TRACE_EVENT0("views", "DesktopScreenX11::GetCursorScreenPoint()");
+
   XDisplay* display = gfx::GetXDisplay();
 
   ::Window root, child;