linux_aura: Improve window drag performance.

ui/views/widget/desktop_aura/desktop_screen_x11.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/widget/desktop_aura/desktop_screen_x11.h"
 
 #include <X11/extensions/Xrandr.h>
 #include <X11/Xlib.h>
 
 // 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"
 #include "ui/aura/root_window_host.h"
 #include "ui/base/x/x11_util.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/display_observer.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/screen.h"
 #include "ui/gfx/x/x11_types.h"
@@ skipping 102 matching lines @@
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopScreenX11, gfx::Screen implementation:
 
 bool DesktopScreenX11::IsDIPEnabled() {
   return false;
 }
 
 gfx::Point DesktopScreenX11::GetCursorScreenPoint() {
+  TRACE_EVENT0("views", "DesktopScreenX11::GetCursorScreenPoint()");
+
   XDisplay* display = gfx::GetXDisplay();
 
   ::Window root, child;
   int root_x, root_y, win_x, win_y;
   unsigned int mask;
   XQueryPointer(display,
                 DefaultRootWindow(display),
                 &root,
                 &child,
                 &root_x,
@@ skipping 199 matching lines @@
   ProcessDisplayChange(new_displays);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 gfx::Screen* CreateDesktopScreen() {
   return new DesktopScreenX11;
 }
 
 }  // namespace views