added CTRL+Click and SHIFT+Click handler for context menu, Back and Forward.

chrome/browser/ui/gtk/menu_gtk.cc

Index: chrome/browser/ui/gtk/menu_gtk.cc
diff --git a/chrome/browser/ui/gtk/menu_gtk.cc b/chrome/browser/ui/gtk/menu_gtk.cc
index d1205792c50a9ba6501c316b28c5fac31caaa5c8..838023ee5993a5811eb2a861bec7caf1a5ed7f3d 100644
--- a/chrome/browser/ui/gtk/menu_gtk.cc
+++ b/chrome/browser/ui/gtk/menu_gtk.cc
@@ -20,7 +20,7 @@
 #include "ui/base/models/button_menu_item_model.h"
 #include "ui/base/models/menu_model.h"
 #include "ui/gfx/gtk_util.h"
-#include "webkit/glue/window_open_disposition.h"
+#include "views/events/event.h"
 
 bool MenuGtk::block_activation_ = false;
 
@@ -707,8 +707,8 @@ void MenuGtk::ExecuteCommand(ui::MenuModel* model, int id) {
 
   GdkEvent* event = gtk_get_current_event();
   if (event && event->type == GDK_BUTTON_RELEASE) {
-    model->ActivatedAtWithDisposition(
-        id, event_utils::DispositionFromEventFlags(event->button.state));
+    int flags = event_utils::GetEventFlagsFromGdkState(event->button.state);
+    model->ActivatedAtWithFlags(id, flags);
   } else {
     model->ActivatedAt(id);
   }