Implement select element list box with shadow DOM.

Source/WebCore/html/HTMLSelectElement.h

Index: Source/WebCore/html/HTMLSelectElement.h
diff --git a/Source/WebCore/html/HTMLSelectElement.h b/Source/WebCore/html/HTMLSelectElement.h
index 0d6da77cef9b185788194c2ae607d27d32de020b..62d2a6aaac3ed66a250cfdbc46e2c56d12df578c 100644
--- a/Source/WebCore/html/HTMLSelectElement.h
+++ b/Source/WebCore/html/HTMLSelectElement.h
@@ -151,6 +151,8 @@ private:
 
     bool hasPlaceholderLabelOption() const;
 
+    virtual void dispatchFormControlChangeEvent() OVERRIDE;
+
     enum SelectOptionFlag {
         DeselectOtherOptions = 1 << 0,
         DispatchChangeEvent = 1 << 1,
@@ -178,6 +180,7 @@ private:
     int firstSelectableListIndex() const;
     int lastSelectableListIndex() const;
     int nextSelectableListIndexPageAway(int startIndex, SkipDirection) const;
+    int listIndexForEvent(Event*);
 
     virtual void childrenChanged(bool changedByParser = false, Node* beforeChange = 0, Node* afterChange = 0, int childCountDelta = 0);
     virtual bool areAuthorShadowsAllowed() const OVERRIDE { return false; }