Trigger options width update when option text changes.

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

Index: third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp b/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
index fec711eb6ea20d6377546c6fd7cf5ed63f9bfbb1..4e2b2efaf6fab013b365737dfd86315b46fea64c 100644
--- a/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLSelectElement.cpp
@@ -439,6 +439,7 @@ void HTMLSelectElement::childrenChanged(const ChildrenChange& 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())