GTK: Add TRACE_EVENTs around gtk ui events.

chrome/browser/ui/gtk/tabs/tab_renderer_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/tabs/tab_renderer_gtk.h"
 
 #include <algorithm>
 #include <utility>
 
+#include "base/debug/trace_event.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/extensions/extension_tab_helper.h"
 #include "chrome/browser/favicon/favicon_tab_helper.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/gtk/bookmarks/bookmark_utils_gtk.h"
 #include "chrome/browser/ui/gtk/custom_button.h"
 #include "chrome/browser/ui/gtk/gtk_theme_service.h"
 #include "chrome/browser/ui/gtk/gtk_util.h"
@@ skipping 1041 matching lines @@
   if (event->button == 2) {
     CloseButtonClicked();
     return TRUE;
   }
 
   return FALSE;
 }
 
 gboolean TabRendererGtk::OnExposeEvent(GtkWidget* widget,
                                        GdkEventExpose* event) {
+  TRACE_EVENT0("ui::gtk", "TabRendererGtk::OnExposeEvent");
+
   PaintTab(widget, event);
   gtk_container_propagate_expose(GTK_CONTAINER(tab_.get()),
                                  close_button_->widget(), event);
   return TRUE;
 }
 
 void TabRendererGtk::OnSizeAllocate(GtkWidget* widget,
                                     GtkAllocation* allocation) {
   gfx::Rect bounds = gfx::Rect(allocation->x, allocation->y,
                                allocation->width, allocation->height);
@@ skipping 37 matching lines @@
 
   close_button_width_ = rb.GetBitmapNamed(IDR_TAB_CLOSE)->width();
   close_button_height_ = rb.GetBitmapNamed(IDR_TAB_CLOSE)->height();
 
   const gfx::Font& base_font = rb.GetFont(ResourceBundle::BaseFont);
   title_font_ = new gfx::Font(base_font.GetFontName(), kFontPixelSize);
   title_font_height_ = title_font_->GetHeight();
 
   initialized_ = true;
 }