Makes it so child views of menuitemview can be traversed with the

views/controls/button/custom_button.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_
 #define VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_
 
 #include "app/animation.h"
 #include "views/controls/button/button.h"
 
@@ skipping 36 matching lines @@
   virtual bool IsFocusable() const;
 
   void set_triggerable_event_flags(int triggerable_event_flags) {
     triggerable_event_flags_ = triggerable_event_flags;
   }
 
   int triggerable_event_flags() const {
     return triggerable_event_flags_;
   }
 
+  // Sets whether |RequestFocus| should be invoked on a mouse press. The default
+  // is true.
+  void set_request_focus_on_press(bool value) {
+    request_focus_on_press_ = value;
+  }
+  bool request_focus_on_press() const { return request_focus_on_press_; }
+
  protected:
   // Construct the Button with a Listener. See comment for Button's ctor.
   explicit CustomButton(ButtonListener* listener);
 
   // Returns true if the event is one that can trigger notifying the listener.
   // This implementation returns true if the left mouse button is down.
   virtual bool IsTriggerableEvent(const MouseEvent& e);
 
   // Overridden from View:
   virtual bool AcceleratorPressed(const Accelerator& accelerator);
@@ skipping 34 matching lines @@
   // Returns whether the button is pushed.
   bool IsPushed() const;
 
   // Should we animate when the state changes? Defaults to true, but false while
   // throbbing.
   bool animate_on_state_change_;
 
   // Mouse event flags which can trigger button actions.
   int triggerable_event_flags_;
 
+  // See description above setter.
+  bool request_focus_on_press_;
+
   DISALLOW_COPY_AND_ASSIGN(CustomButton);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_