MacViews: Fix behavior of move and select commands when selection direction changes.

ui/views/controls/textfield/textfield_test_api.h

Index: ui/views/controls/textfield/textfield_test_api.h
diff --git a/ui/views/controls/textfield/textfield_test_api.h b/ui/views/controls/textfield/textfield_test_api.h
index 4505b71290700891866ea2a4820c8514f8cf2cda..02f4d542757006d797571ace896b504b94706ce4 100644
--- a/ui/views/controls/textfield/textfield_test_api.h
+++ b/ui/views/controls/textfield/textfield_test_api.h
@@ -25,6 +25,10 @@ class TextfieldTestApi {
 
   TextfieldModel* model() const { return textfield_->model_.get(); }
 
+  void ExecuteTextEditCommand(ui::TextEditCommand command) {
+    textfield_->ExecuteTextEditCommand(command);
+  }
+
   ui::MenuModel* context_menu_contents() const {
     return textfield_->context_menu_contents_.get();
   }