linux_aura: Improve window drag performance.

ui/views/widget/desktop_aura/desktop_root_window_host_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_root_window_host_x11.h"
 
 #include <X11/extensions/shape.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xregion.h>
 #include <X11/Xutil.h>
 
 #include "base/basictypes.h"
+#include "base/debug/trace_event.h"
 #include "base/message_loop/message_pump_x11.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/client/focus_client.h"
 #include "ui/aura/client/user_action_client.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window_property.h"
 #include "ui/base/dragdrop/os_exchange_data_provider_aurax11.h"
@@ skipping 1060 matching lines @@
     open_windows_ = new std::list<XID>();
   return *open_windows_;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopRootWindowHostX11, MessageLoop::Dispatcher implementation:
 
 bool DesktopRootWindowHostX11::Dispatch(const base::NativeEvent& event) {
   XEvent* xev = event;
 
+  TRACE_EVENT1("views", "DesktopRootWindowHostX11::Dispatch",
+               "event->type", event->type);
+
   // May want to factor CheckXEventForConsistency(xev); into a common location
   // since it is called here.
   switch (xev->type) {
     case EnterNotify:
     case LeaveNotify: {
       ui::MouseEvent mouse_event(xev);
       DispatchMouseEvent(&mouse_event);
       break;
     }
     case Expose: {
@@ skipping 313 matching lines @@
   if (linux_ui) {
     ui::NativeTheme* native_theme = linux_ui->GetNativeTheme();
     if (native_theme)
       return native_theme;
   }
 
   return ui::NativeTheme::instance();
 }
 
 }  // namespace views