Implement tooltips for the Go/Stop button in Linux.

chrome/browser/gtk/location_bar_view_gtk.h

Index: chrome/browser/gtk/location_bar_view_gtk.h
diff --git a/chrome/browser/gtk/location_bar_view_gtk.h b/chrome/browser/gtk/location_bar_view_gtk.h
index 8f4d017cc0d98901fb154aad8003f4cdf1916d0a..104352c9725db435c034ecfb19d2ba76bb6081e5 100644
--- a/chrome/browser/gtk/location_bar_view_gtk.h
+++ b/chrome/browser/gtk/location_bar_view_gtk.h
@@ -12,6 +12,7 @@
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
 #include "chrome/browser/autocomplete/autocomplete_edit.h"
+#include "chrome/browser/autocomplete/autocomplete_edit_view_gtk.h"
 #include "chrome/browser/location_bar.h"
 #include "chrome/common/owned_widget_gtk.h"
 #include "chrome/common/page_transition_types.h"
@@ -43,6 +44,10 @@ class LocationBarViewGtk : public AutocompleteEditController,
   // restore saved state that the tab holds.
   void Update(const TabContents* tab_for_state_restoring);
 
+  AutocompleteEditView* location_entry() {
+    return location_entry_.get();
+  }
+
   // Implement the AutocompleteEditController interface.
   virtual void OnAutocompleteAccept(const GURL& url,
       WindowOpenDisposition disposition,