Introduce isHTMLAnchorElement and toHTMLAnchorElement

Source/core/html/HTMLAnchorElement.h

Index: Source/core/html/HTMLAnchorElement.h
diff --git a/Source/core/html/HTMLAnchorElement.h b/Source/core/html/HTMLAnchorElement.h
index 5cc83ca2b3e70d7471ed4a1d46390c4782c5533a..a63c563427e3cd942080d871b18207dce046a008 100644
--- a/Source/core/html/HTMLAnchorElement.h
+++ b/Source/core/html/HTMLAnchorElement.h
@@ -158,6 +158,22 @@ inline LinkHash HTMLAnchorElement::visitedLinkHash() const
 bool isEnterKeyKeydownEvent(Event*);
 bool isLinkClick(Event*);
 
+inline bool isHTMLAnchorElement(const Node* node)
+{
+    return node->hasTagName(HTMLNames::aTag);
+}
+
+inline bool isHTMLAnchorElement(const Element* element)
+{
+    return element->hasTagName(HTMLNames::aTag);
+}
+
+inline HTMLAnchorElement* toHTMLAnchorElement(Node* node)
+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!node || isHTMLAnchorElement(node));
+    return static_cast<HTMLAnchorElement*>(node);
+}
+
 } // namespace WebCore
 
 #endif // HTMLAnchorElement_h