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

views/controls/menu/menu_model_adapter.cc

Index: views/controls/menu/menu_model_adapter.cc
diff --git a/views/controls/menu/menu_model_adapter.cc b/views/controls/menu/menu_model_adapter.cc
index 9da389de742efdbe4da3fcf261274fa2eb917c8c..eb8a35e0b2c0d0971a45b13102c87e626a3d90b6 100644
--- a/views/controls/menu/menu_model_adapter.cc
+++ b/views/controls/menu/menu_model_adapter.cc
@@ -55,10 +55,7 @@ void MenuModelAdapter::ExecuteCommand(int id, int mouse_event_flags) {
   ui::MenuModel* model = menu_model_;
   int index = 0;
   if (ui::MenuModel::GetModelAndIndexForCommandId(id, &model, &index)) {
-    const int disposition =
-        ViewsDelegate::views_delegate->GetDispositionForEvent(
-            mouse_event_flags);
-    model->ActivatedAtWithDisposition(index, disposition);
+    model->ActivatedAtWithFlags(index, mouse_event_flags);
     return;
   }