Make panels turn on or off shadow effect.

chrome/browser/ui/cocoa/panels/panel_window_controller_cocoa.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_
 #define CHROME_BROWSER_UI_COCOA_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_
 
 // A class acting as the Objective-C controller for the Panel window
 // object. Handles interactions between Cocoa and the cross-platform
 // code. Each window has a single titlebar and is managed/owned by Panel.
@@ skipping 119 matching lines @@
 // version using the current panel expanstion state.
 - (void)updateWindowLevel;
 - (void)updateWindowLevel:(BOOL)panelIsMinimized;
 
 // Adjusts NSWindowCollectionBehavior based on whether panel is always on top.
 - (void)updateWindowCollectionBehavior;
 
 // Turns on user-resizable corners/sides indications and enables live resize.
 - (void)enableResizeByMouse:(BOOL)enable;
 
+// Turns on/off shadow effect around the window shape.
+- (void)showShadow:(BOOL)show;
+
 - (NSRect)frameRectForContentRect:(NSRect)contentRect;
 - (NSRect)contentRectForFrameRect:(NSRect)frameRect;
 
 @end  // @interface PanelWindowController
 
 #endif  // CHROME_BROWSER_UI_COCOA_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_