Make panels not show on top when there is an app running in full screen mode.

chrome/browser/ui/panels/panel_window_controller_cocoa.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_
 #define CHROME_BROWSER_UI_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 107 matching lines @@
 // NSAnimationDelegate method, invoked when bounds animation is finished.
 - (void)animationDidEnd:(NSAnimation*)animation;
 // Terminates current bounds animation, if any.
 - (void)terminateBoundsAnimation;
 
 - (BOOL)isAnimatingBounds;
 
 // Removes the Key status from the panel to some other window.
 - (void)deactivate;
 
+// See Panel::FullScreenModeChanged
+- (void)fullScreenModeChanged:(bool)isFullScreenModeOn;
+
 // Helper for NSWindow, returns NO for minimized panels in some cases, so they
 // are not un-minimized when another panel is minimized.
 - (BOOL)canBecomeKeyWindow;
 
 @end  // @interface PanelWindowController
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_