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

views/controls/button/custom_button.h

Index: views/controls/button/custom_button.h
diff --git a/views/controls/button/custom_button.h b/views/controls/button/custom_button.h
index 9f2cb9fe8672648d4cbc964e21809d4711947269..5801401ab696a3c8c67dce7d9433ed8e7807c411 100644
--- a/views/controls/button/custom_button.h
+++ b/views/controls/button/custom_button.h
@@ -54,6 +54,13 @@ class CustomButton : public Button,
     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);
@@ -108,6 +115,9 @@ class CustomButton : public Button,
   // 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);
 };