GTK: Add TRACE_EVENTs around gtk ui events.

chrome/browser/ui/gtk/infobars/extension_infobar_gtk.cc

 // Copyright (c) 2011 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 "chrome/browser/ui/gtk/infobars/extension_infobar_gtk.h"
 
+#include "base/debug/trace_event.h"
 #include "chrome/browser/extensions/extension_context_menu_model.h"
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/ui/gtk/browser_window_gtk.h"
 #include "chrome/browser/ui/gtk/custom_button.h"
 #include "chrome/browser/ui/gtk/gtk_chrome_button.h"
 #include "chrome/browser/ui/gtk/gtk_util.h"
 #include "chrome/browser/ui/gtk/infobars/infobar_container_gtk.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_icon_set.h"
@@ skipping 168 matching lines @@
 
   gtk_chrome_button_set_paint_state(GTK_CHROME_BUTTON(widget),
                                     GTK_STATE_ACTIVE);
   ShowMenuWithModel(widget, this, model);
 
   return TRUE;
 }
 
 gboolean ExtensionInfoBarGtk::OnExpose(GtkWidget* sender,
                                        GdkEventExpose* event) {
+  TRACE_EVENT0("ui::gtk", "ExtensionInfoBarGtk::OnExpose");
+
   // We also need to draw our infobar arrows over the renderer.
   static_cast<InfoBarContainerGtk*>(container())->
       PaintInfobarBitsOn(sender, event, this);
 
   return FALSE;
 }
 
 InfoBar* ExtensionInfoBarDelegate::CreateInfoBar(InfoBarTabHelper* owner) {
   return new ExtensionInfoBarGtk(owner, this);
 }