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 64a9224b6b91c83c3ede9b80d9f15a5bef249576..f5a2dd680a709afb26fb01574d102cf3ab17e01a 100644
--- a/chrome/browser/ui/panels/panel_browser_window_cocoa.mm
+++ b/chrome/browser/ui/panels/panel_browser_window_cocoa.mm
@@ -238,6 +238,11 @@ void PanelBrowserWindowCocoa::HandlePanelKeyboardEvent(
   }
 }
 
+void PanelBrowserWindowCocoa::FullScreenModeChanged(
+    bool is_full_screen_mode_on) {
+  [controller_ fullScreenModeChanged:is_full_screen_mode_on];
+}
+
 Browser* PanelBrowserWindowCocoa::GetPanelBrowser() const {
   return browser();
 }