Recalc list items for <select> before updating style for the select.

Source/core/html/HTMLSelectElement.cpp

Index: Source/core/html/HTMLSelectElement.cpp
diff --git a/Source/core/html/HTMLSelectElement.cpp b/Source/core/html/HTMLSelectElement.cpp
index 40e693be924001375294aac11ae0a0f410e5de77..f73d7202922a81c2a58435b47c91fc66e624ee9f 100644
--- a/Source/core/html/HTMLSelectElement.cpp
+++ b/Source/core/html/HTMLSelectElement.cpp
@@ -85,6 +85,7 @@ HTMLSelectElement::HTMLSelectElement(Document& document, HTMLFormElement* form)
     , m_suggestedIndex(-1)
     , m_isAutofilledByPreview(false)
 {
+    setHasCustomStyleCallbacks();
 }
 
 PassRefPtrWillBeRawPtr<HTMLSelectElement> HTMLSelectElement::create(Document& document)
@@ -1751,6 +1752,14 @@ DEFINE_TRACE(HTMLSelectElement)
     HTMLFormControlElementWithState::trace(visitor);
 }
 
+void HTMLSelectElement::willRecalcStyle(StyleRecalcChange change)
+{
+    // TODO(esprehn): recalcListItems will update the selected states of list

[ojan, 2015/06/19 01:05:02]

It's not clear what the TODO here is.

+    // items so we need to do it first so we match the correct style <option>'s.
+    if (m_shouldRecalcListItems)
+        recalcListItems();
+}
+
 void HTMLSelectElement::didAddUserAgentShadowRoot(ShadowRoot& root)
 {
     RefPtrWillBeRawPtr<HTMLContentElement> content = HTMLContentElement::create(document());