Make the location bar generate accessibility extension API events...

chrome/browser/views/location_bar/location_bar_view.h

Index: chrome/browser/views/location_bar/location_bar_view.h
===================================================================
--- chrome/browser/views/location_bar/location_bar_view.h	(revision 51112)
+++ chrome/browser/views/location_bar/location_bar_view.h	(working copy)
@@ -26,6 +26,7 @@
 #include "chrome/browser/autocomplete/autocomplete_edit_view_win.h"
 #else
 #include "chrome/browser/autocomplete/autocomplete_edit_view_gtk.h"
+#include "chrome/browser/gtk/accessible_widget_helper_gtk.h"
 #endif
 
 class Browser;
@@ -356,6 +357,10 @@
   // focused. Used when the toolbar is in full keyboard accessibility mode.
   bool show_focus_rect_;
 
+#if defined(OS_LINUX)
+  scoped_ptr<AccessibleWidgetHelper> accessible_widget_helper_;
+#endif
+
   // Used to schedule a task for the first run info bubble.
   ScopedRunnableMethodFactory<LocationBarView> first_run_bubble_;