Trigger options width update when option text changes.

third_party/WebKit/Source/core/html/HTMLSelectElement.cpp

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
@@ skipping 421 matching lines @@
     setRecalcListItems();
     setNeedsValidityCheck();
     m_lastOnChangeSelection.clear();
 
     HTMLFormControlElementWithState::childrenChanged(change);
 }
 
 void HTMLSelectElement::optionElementChildrenChanged()
 {
     setNeedsValidityCheck();
+    setOptionsChangedOnLayoutObject();

[tkent, 2016/02/22 23:18:38]

The |OptionsChanged| flag is referred only in
LayoutMenuList::updateFromElement().  Who calls updateFromElement() in this
case?

[rune, 2016/02/23 00:41:42]

HTMLFormControlElement::didRecalcStyle() which is called for the
HTMLSelectElement from Element::recalcStyle(). And there is a recalc style
traversing past the select because the option text node needs a style recalc.

 
     if (layoutObject()) {
         if (AXObjectCache* cache = layoutObject()->document().existingAXObjectCache())
             cache->childrenChanged(this);
     }
 }
 
 void HTMLSelectElement::accessKeyAction(bool sendMouseEvents)
 {
     focus();
@@ skipping 1565 matching lines @@
     m_popupIsVisible = false;
     m_popup = nullptr;
 }
 
 void HTMLSelectElement::resetTypeAheadSessionForTesting()
 {
     m_typeAhead.resetSession();
 }
 
 } // namespace blink