Add support for element ids in TargetedStyleRecalc

Source/core/css/invalidation/DescendantInvalidationSet.h

Index: Source/core/css/invalidation/DescendantInvalidationSet.h
diff --git a/Source/core/css/invalidation/DescendantInvalidationSet.h b/Source/core/css/invalidation/DescendantInvalidationSet.h
index 92646fcb680ace3b847b6ac98efe94dd5dc1cfae..e52ba79886bb2270749e36b6007b4f428b3ee909 100644
--- a/Source/core/css/invalidation/DescendantInvalidationSet.h
+++ b/Source/core/css/invalidation/DescendantInvalidationSet.h
@@ -64,6 +64,9 @@ public:
     // Appends the attributes in this DescendantInvalidationSet to the vector.
     void getAttributes(Vector<AtomicString>& attributes) const;
 
+    // Appends the ids in this DescendantInvalidationSet to the vector.
+    void getIds(Vector<AtomicString>& ids) const;
+
     void setWholeSubtreeInvalid();
     bool wholeSubtreeInvalid() const { return m_allDescendantsMightBeInvalid; }