Add the button style for combobox

ui/views/controls/menu/menu_runner.h

Index: ui/views/controls/menu/menu_runner.h
diff --git a/ui/views/controls/menu/menu_runner.h b/ui/views/controls/menu/menu_runner.h
index 277ffd5334a41005ec75d84762cc579fadb4c6d5..d4c091fceb018c054363b46f0e113561149b736d 100644
--- a/ui/views/controls/menu/menu_runner.h
+++ b/ui/views/controls/menu/menu_runner.h
@@ -18,6 +18,7 @@ namespace views {
 
 class MenuButton;
 class MenuModelAdapter;
+class MenuRunnerCore;
 class Widget;
 
 namespace internal {
@@ -111,11 +112,20 @@ class VIEWS_EXPORT MenuRunner {
   // Returns the time from the event which closed the menu - or 0.
   base::TimeDelta closing_event_time() const;
 
+  // Sets an implementation of RunMenuAt. This is intended to be used at test.
+  void set_runner_core(MenuRunnerCore* runner_core) {

[sky, 2013/12/09 14:54:04]

Make this private and only settable by way of a test friend api, eg
MenuRunnerTestApi or MenuRunnerTestHelper. Said class is only compiled for test
code. Also, can this be a scoped_ptr?

[hajimehoshi, 2013/12/10 06:04:25]

Done.

+    runner_core_ = runner_core;
+  }
+
  private:
   scoped_ptr<MenuModelAdapter> menu_model_adapter_;
 
   internal::MenuRunnerImpl* holder_;
 
+  // An implementation of RunMenuAt. This is usually NULL and ignored. If this
+  // is not NULL, this implementation will be used.
+  MenuRunnerCore* runner_core_;
+
   scoped_ptr<internal::DisplayChangeListener> display_change_listener_;
 
   DISALLOW_COPY_AND_ASSIGN(MenuRunner);