Add support for element ids in TargetedStyleRecalc

Source/core/css/invalidation/DescendantInvalidationSet.cpp

Index: Source/core/css/invalidation/DescendantInvalidationSet.cpp
diff --git a/Source/core/css/invalidation/DescendantInvalidationSet.cpp b/Source/core/css/invalidation/DescendantInvalidationSet.cpp
index 18bd5b630b493a8274db71cdfbbba6579fc8b562..e378c194610e672f73ab43df5257ca7b26a5cb02 100644
--- a/Source/core/css/invalidation/DescendantInvalidationSet.cpp
+++ b/Source/core/css/invalidation/DescendantInvalidationSet.cpp
@@ -153,6 +153,14 @@ void DescendantInvalidationSet::getAttributes(Vector<AtomicString>& attributes)
         attributes.append(*it);
 }
 
+void DescendantInvalidationSet::getIds(Vector<AtomicString>& ids) const
+{
+    if (!m_ids)
+        return;
+    for (HashSet<AtomicString>::const_iterator it = m_ids->begin(); it != m_ids->end(); ++it)
+        ids.append(*it);
+}
+
 void DescendantInvalidationSet::setWholeSubtreeInvalid()
 {
     if (m_allDescendantsMightBeInvalid)