Change the visual appearance of panel on GTK per new UI design.

chrome/chrome_browser.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
@@ skipping 2867 matching lines @@
         'browser/ui/gtk/bookmarks/bookmark_sub_menu_model_gtk.cc',
         'browser/ui/gtk/bookmarks/bookmark_sub_menu_model_gtk.h',
         'browser/ui/gtk/bookmarks/bookmark_tree_model.cc',
         'browser/ui/gtk/bookmarks/bookmark_tree_model.h',
         'browser/ui/gtk/bookmarks/bookmark_utils_gtk.cc',
         'browser/ui/gtk/bookmarks/bookmark_utils_gtk.h',
         'browser/ui/gtk/browser_actions_toolbar_gtk.cc',
         'browser/ui/gtk/browser_actions_toolbar_gtk.h',
         'browser/ui/gtk/browser_titlebar.cc',
         'browser/ui/gtk/browser_titlebar.h',
+        'browser/ui/gtk/browser_titlebar_base.h',
+        'browser/ui/gtk/browser_titlebar_throbber.cc',
+        'browser/ui/gtk/browser_titlebar_throbber.h',
         'browser/ui/gtk/browser_toolbar_gtk.cc',
         'browser/ui/gtk/browser_toolbar_gtk.h',
         'browser/ui/gtk/browser_window_gtk.cc',
         'browser/ui/gtk/browser_window_gtk.h',
         'browser/ui/gtk/bubble/bubble_accelerators_gtk.cc',
         'browser/ui/gtk/bubble/bubble_accelerators_gtk.h',
         'browser/ui/gtk/bubble/bubble_gtk.cc',
         'browser/ui/gtk/bubble/bubble_gtk.h',
         'browser/ui/gtk/certificate_viewer_gtk.cc',
         'browser/ui/gtk/chrome_browser_main_extra_parts_gtk.cc',
@@ skipping 243 matching lines @@
         'browser/ui/panels/native_panel.h',
         'browser/ui/panels/native_panel_cocoa.h',
         'browser/ui/panels/old_panel.cc',
         'browser/ui/panels/old_panel.h',
         'browser/ui/panels/panel.cc',
         'browser/ui/panels/panel.h',
         'browser/ui/panels/panel_bounds_animation.cc',
         'browser/ui/panels/panel_bounds_animation.h',
         'browser/ui/panels/panel_browser_frame_view.cc',
         'browser/ui/panels/panel_browser_frame_view.h',
+        'browser/ui/panels/panel_browser_titlebar_gtk.cc',
+        'browser/ui/panels/panel_browser_titlebar_gtk.h',
         'browser/ui/panels/panel_browser_view.cc',
         'browser/ui/panels/panel_browser_view.h',
-        'browser/ui/panels/panel_browser_titlebar_gtk.cc',
-        'browser/ui/panels/panel_browser_titlebar_gtk.h',
         'browser/ui/panels/panel_browser_window.cc',
         'browser/ui/panels/panel_browser_window.h',
         'browser/ui/panels/panel_browser_window_cocoa.h',
         'browser/ui/panels/panel_browser_window_cocoa.mm',
         'browser/ui/panels/panel_browser_window_gtk.cc',
         'browser/ui/panels/panel_browser_window_gtk.h',
         'browser/ui/panels/panel_constants.h',
         'browser/ui/panels/panel_drag_controller.cc',
         'browser/ui/panels/panel_drag_controller.h',
         'browser/ui/panels/panel_drag_gtk.cc',
@@ skipping 2009 matching lines @@
         'browser/metrics/proto/study.proto',
       ],
       'variables': {
         'proto_in_dir': 'browser/metrics/proto',
         'proto_out_dir': 'chrome/browser/metrics/proto',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }