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

chrome/browser/ui/gtk/browser_window_gtk.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 "chrome/browser/ui/gtk/browser_window_gtk.h"
 
 #include <dlfcn.h>
 #include <gdk/gdkkeysyms.h>
 
 #include <algorithm>
@@ skipping 419 matching lines @@
 
   // Setting _GTK_HIDE_TITLEBAR_WHEN_MAXIMIZED tells gnome-shell to not force
   // fullscreen on the window when it matches the desktop size.
   ui::SetHideTitlebarWhenMaximizedProperty(
       ui::GetX11WindowFromGtkWidget(GTK_WIDGET(window_)));
 }
 
 gboolean BrowserWindowGtk::OnCustomFrameExpose(GtkWidget* widget,
                                                GdkEventExpose* event) {
   TRACE_EVENT0("ui::gtk", "BrowserWindowGtk::OnCustomFrameExpose");
+  DrawFrame(widget, event);
+  return FALSE;  // Allow subwidgets to paint.
+}
 
+void BrowserWindowGtk::DrawFrame(GtkWidget* widget, GdkEventExpose* event) {
   // Draw the default background.
   cairo_t* cr = gdk_cairo_create(gtk_widget_get_window(widget));
   gdk_cairo_rectangle(cr, &event->area);
   cairo_clip(cr);
 
   if (UsingCustomPopupFrame()) {
     DrawPopupFrame(cr, widget, event);
   } else {
     DrawCustomFrame(cr, widget, event);
   }
 
   DrawContentShadow(cr);
 
   cairo_destroy(cr);
 
   if (UseCustomFrame() && !IsMaximized())
     DrawCustomFrameBorder(widget);
-
-  return FALSE;  // Allow subwidgets to paint.
 }
 
 void BrowserWindowGtk::DrawCustomFrameBorder(GtkWidget* widget) {
   static NineBox* custom_frame_border = NULL;
   if (!custom_frame_border) {
     custom_frame_border = new NineBox(IDR_WINDOW_TOP_LEFT_CORNER,
                                       IDR_WINDOW_TOP_CENTER,
                                       IDR_WINDOW_TOP_RIGHT_CORNER,
                                       IDR_WINDOW_LEFT_SIDE,
                                       0,
@@ skipping 2002 matching lines @@
 bool BrowserWindowGtk::IsBookmarkBarSupported() const {
   return browser_->SupportsWindowFeature(Browser::FEATURE_BOOKMARKBAR);
 }
 
 bool BrowserWindowGtk::UsingCustomPopupFrame() const {
   GtkThemeService* theme_provider = GtkThemeService::GetFrom(
       browser()->profile());
   return !theme_provider->UsingNativeTheme() && browser()->is_type_popup();
 }
 
-BrowserTitlebar* BrowserWindowGtk::CreateBrowserTitlebar() {
+BrowserTitlebarBase* BrowserWindowGtk::CreateBrowserTitlebar() {
   return new BrowserTitlebar(this, window_);
 }
 
 bool BrowserWindowGtk::GetWindowEdge(int x, int y, GdkWindowEdge* edge) {
   if (!UseCustomFrame())
     return false;
 
   if (IsMaximized() || IsFullscreen())
     return false;
 
@@ skipping 108 matching lines @@
           wm_type == ui::WM_OPENBOX ||
           wm_type == ui::WM_XFWM4);
 }
 
 // static
 BrowserWindow* BrowserWindow::CreateBrowserWindow(Browser* browser) {
   BrowserWindowGtk* browser_window_gtk = new BrowserWindowGtk(browser);
   browser_window_gtk->Init();
   return browser_window_gtk;
 }