Make panels turn on or off shadow effect.

chrome/browser/ui/gtk/panels/panel_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/panels/panel_gtk.h"
 
 #include <gdk/gdk.h>
 #include <gdk/gdkkeysyms.h>
 #include <X11/XF86keysym.h>
 
@@ skipping 308 matching lines @@
 
 void PanelGtk::MinimizePanelBySystem() {
   NOTIMPLEMENTED();
 }
 
 bool PanelGtk::IsPanelMinimizedBySystem() const {
   NOTIMPLEMENTED();
   return false;
 }
 
+void PanelGtk::SetPanelHasShadow(bool has_shadow) {
+  NOTIMPLEMENTED();
+}
+
 void PanelGtk::UpdateWindowShape() {
   int width = configure_size_.width();
   int height = configure_size_.height();
   if (!width || !height)
     return;
 
   GdkRegion* mask;
   if (corner_style_ & panel::TOP_ROUNDED) {
     GdkRectangle top_top_rect = { 3, 0, width - 6, 1 };
     GdkRectangle top_mid_rect = { 1, 1, width - 2, 2 };
@@ skipping 809 matching lines @@
     default:
       NOTREACHED();
       return false;
   }
   return gtk_widget_get_visible(button->widget());
 }
 
 panel::CornerStyle GtkNativePanelTesting::GetWindowCornerStyle() const {
   return panel_gtk_->corner_style_;
 }