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

chrome/browser/ui/panels/panel_browser_window_cocoa.mm

Index: chrome/browser/ui/panels/panel_browser_window_cocoa.mm
diff --git a/chrome/browser/ui/panels/panel_browser_window_cocoa.mm b/chrome/browser/ui/panels/panel_browser_window_cocoa.mm
index ba84b09dfb6e3578cac2983ef0177054de45f4cd..f56c75bd8a04b99730c59ebf62b421dcf59a1447 100644
--- a/chrome/browser/ui/panels/panel_browser_window_cocoa.mm
+++ b/chrome/browser/ui/panels/panel_browser_window_cocoa.mm
@@ -247,6 +247,11 @@ void PanelBrowserWindowCocoa::HandlePanelKeyboardEvent(
   }
 }
 
+void PanelBrowserWindowCocoa::FullScreenModeChanged(
+    bool is_full_screen) {
+  [controller_ fullScreenModeChanged:is_full_screen];
+}
+
 Browser* PanelBrowserWindowCocoa::GetPanelBrowser() const {
   return browser();
 }