Support tag names as invalidation set features.

Source/core/css/invalidation/StyleInvalidator.h

Index: Source/core/css/invalidation/StyleInvalidator.h
diff --git a/Source/core/css/invalidation/StyleInvalidator.h b/Source/core/css/invalidation/StyleInvalidator.h
index 10935abac4b4cde3ac407eb63a1798a83a858fd9..e8bd7f9a59976f94efa804c140fed7afa226b26d 100644
--- a/Source/core/css/invalidation/StyleInvalidator.h
+++ b/Source/core/css/invalidation/StyleInvalidator.h
@@ -42,6 +42,7 @@ private:
         Vector<AtomicString> m_invalidationClasses;
         Vector<AtomicString> m_invalidationAttributes;
         Vector<AtomicString> m_invalidationIds;
+        Vector<AtomicString> m_invalidationTagNames;
         bool m_foundInvalidationSet;
         bool m_invalidateCustomPseudo;
     };
@@ -52,6 +53,7 @@ private:
             : m_prevClassLength(data->m_invalidationClasses.size()),
             m_prevAttributeLength(data->m_invalidationAttributes.size()),
             m_prevIdLength(data->m_invalidationIds.size()),
+            m_prevTagNameLength(data->m_invalidationTagNames.size()),
             m_prevFoundInvalidationSet(data->m_foundInvalidationSet),
             m_prevInvalidateCustomPseudo(data->m_invalidateCustomPseudo),
             m_data(data)
@@ -61,6 +63,7 @@ private:
             m_data->m_invalidationClasses.remove(m_prevClassLength, m_data->m_invalidationClasses.size() - m_prevClassLength);
             m_data->m_invalidationAttributes.remove(m_prevAttributeLength, m_data->m_invalidationAttributes.size() - m_prevAttributeLength);
             m_data->m_invalidationIds.remove(m_prevIdLength, m_data->m_invalidationIds.size() - m_prevIdLength);
+            m_data->m_invalidationTagNames.remove(m_prevTagNameLength, m_data->m_invalidationTagNames.size() - m_prevTagNameLength);
             m_data->m_foundInvalidationSet = m_prevFoundInvalidationSet;
             m_data->m_invalidateCustomPseudo = m_prevInvalidateCustomPseudo;
         }
@@ -69,6 +72,7 @@ private:
         int m_prevClassLength;
         int m_prevAttributeLength;
         int m_prevIdLength;
+        int m_prevTagNameLength;
         bool m_prevFoundInvalidationSet;
         bool m_prevInvalidateCustomPseudo;
         RecursionData* m_data;