Use extension to show activation message.

views/controls/menu/menu_host_gtk.cc

 // Copyright (c) 2010 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 "views/controls/menu/menu_host_gtk.h"
 
 #include <gdk/gdk.h>
 
 #if defined(HAVE_XINPUT2) && defined(TOUCH_UI)
 #include <gdk/gdkx.h>
@@ skipping 144 matching lines @@
   // events from other apps.
   GdkGrabStatus pointer_grab_status =
       gdk_pointer_grab(window_contents()->window, FALSE,
                        static_cast<GdkEventMask>(
                            GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
                            GDK_POINTER_MOTION_MASK),
                        NULL, NULL, GDK_CURRENT_TIME);
   GdkGrabStatus keyboard_grab_status =
       gdk_keyboard_grab(window_contents()->window, FALSE,
                         GDK_CURRENT_TIME);
+  if (pointer_grab_status == GDK_GRAB_NOT_VIEWABLE) {

[zel, 2011/03/15 18:39:45]

does this file belong in this CL? does not seem related to me

+    DCHECK_EQ(GDK_GRAB_NOT_VIEWABLE, keyboard_grab_status);
+    GtkWidget* current_grab_window = gtk_grab_get_current();
+    if (current_grab_window)
+      gtk_grab_remove(current_grab_window);
+    return;
+  }
 
   did_input_grab_ = pointer_grab_status == GDK_GRAB_SUCCESS &&
       keyboard_grab_status == GDK_GRAB_SUCCESS;
 
 #if defined(HAVE_XINPUT2) && defined(TOUCH_UI)
   ::Window window = GDK_WINDOW_XID(window_contents()->window);
   Display* display = GDK_WINDOW_XDISPLAY(window_contents()->window);
   bool xi2grab = TouchFactory::GetInstance()->GrabTouchDevices(display, window);
   did_input_grab_ = did_input_grab_ && xi2grab;
 #endif
 
-  DCHECK(did_input_grab_);
+  DCHECK_EQ(GDK_GRAB_SUCCESS, pointer_grab_status);
+  DCHECK_EQ(GDK_GRAB_SUCCESS, keyboard_grab_status);
   // need keyboard grab.
 }
 
 }  // namespace views