Use extension to show activation message.

views/controls/menu/menu_host_gtk.cc

Index: views/controls/menu/menu_host_gtk.cc
diff --git a/views/controls/menu/menu_host_gtk.cc b/views/controls/menu/menu_host_gtk.cc
index 9615e549b9ba991ca02c52cc8aa06e466354a01d..653f66c6c01e8964e97b565f5593e1ec8d3acf42 100644
--- a/views/controls/menu/menu_host_gtk.cc
+++ b/views/controls/menu/menu_host_gtk.cc
@@ -162,6 +162,13 @@ void MenuHostGtk::DoCapture() {
   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;
@@ -173,7 +180,8 @@ void MenuHostGtk::DoCapture() {
   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.
 }