Do not show notifications when in fullscreen or screensaver mode....

chrome/browser/ui/gtk/gtk_util.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/gtk/gtk_util.h"
 
 #include <cairo/cairo.h>
 #include <gdk/gdkx.h>
 #include <gtk/gtk.h>
 
@@ skipping 530 matching lines @@
   return centering_vbox;
 }
 
 bool IsScreenComposited() {
   GdkScreen* screen = gdk_screen_get_default();
   return gdk_screen_is_composited(screen) == TRUE;
 }
 
 void EnumerateTopLevelWindows(ui::EnumerateWindowsDelegate* delegate) {
   std::vector<XID> stack;
-  if (!ui::GetXWindowStack(&stack)) {
+  if (!ui::GetXWindowStack(ui::GetX11RootWindow(), &stack)) {
     // Window Manager doesn't support _NET_CLIENT_LIST_STACKING, so fall back
     // to old school enumeration of all X windows.  Some WMs parent 'top-level'
     // windows in unnamed actual top-level windows (ion WM), so extend the
     // search depth to all children of top-level windows.
     const int kMaxSearchDepth = 1;
     ui::EnumerateAllWindows(delegate, kMaxSearchDepth);
     return;
   }
 
   std::vector<XID>::iterator iter;
@@ skipping 679 matching lines @@
 
 void DoCopy(BrowserWindow* window) {
   DoCutCopyPaste(window, &RenderViewHost::Copy, "copy-clipboard");
 }
 
 void DoPaste(BrowserWindow* window) {
   DoCutCopyPaste(window, &RenderViewHost::Paste, "paste-clipboard");
 }
 
 }  // namespace gtk_util