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

Index: chrome/browser/ui/panels/panel_window_controller_cocoa.h
diff --git a/chrome/browser/ui/panels/panel_window_controller_cocoa.h b/chrome/browser/ui/panels/panel_window_controller_cocoa.h
index c3e33c480e070e07f433a47a69ecd10869ac3206..946a5783953b043fe16e4970fc19d789c869889c 100644
--- a/chrome/browser/ui/panels/panel_window_controller_cocoa.h
+++ b/chrome/browser/ui/panels/panel_window_controller_cocoa.h
@@ -125,6 +125,9 @@ class PanelBrowserWindowCocoa;
 // 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;