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

chrome/browser/ui/panels/panel_browser_window_gtk.cc

 // 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.
 
 #include "chrome/browser/ui/panels/panel_browser_window_gtk.h"
 
 #include "base/bind.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/panels/panel.h"
 #include "chrome/browser/ui/panels/panel_manager.h"
@@ skipping 348 matching lines @@
 bool PanelBrowserWindowGtk::IsDrawingAttention() const {
   return is_drawing_attention_;
 }
 
 bool PanelBrowserWindowGtk::PreHandlePanelKeyboardEvent(
     const NativeWebKeyboardEvent& event,
     bool* is_keyboard_shortcut) {
   return PreHandleKeyboardEvent(event, is_keyboard_shortcut);
 }
 
+void PanelBrowserWindowGtk::FullScreenModeChanged(bool is_full_screen) {
+  // Nothing to do here as z-order rules for panels ensures that they're below
+  // any app running in full screen mode.
+}
+
 void PanelBrowserWindowGtk::HandlePanelKeyboardEvent(
     const NativeWebKeyboardEvent& event) {
   HandleKeyboardEvent(event);
 }
 
 Browser* PanelBrowserWindowGtk::GetPanelBrowser() const {
   return browser();
 }
 
 void PanelBrowserWindowGtk::DestroyPanelBrowser() {
@@ skipping 373 matching lines @@
   }
 }
 
 bool NativePanelTestingGtk::IsWindowSizeKnown() const {
   return panel_browser_window_gtk_->window_size_known_;
 }
 
 bool NativePanelTestingGtk::IsAnimatingBounds() const {
   return panel_browser_window_gtk_->IsAnimatingBounds();
 }