New interface and function for form association

third_party/WebKit/Source/core/html/ListedElement.h

Index: third_party/WebKit/Source/core/html/ListedElement.h
diff --git a/third_party/WebKit/Source/core/html/ListedElement.h b/third_party/WebKit/Source/core/html/ListedElement.h
index cda9257a7a5280c2b7c263c07b83c1781234039a..dadf3d4af2ec82d1dcc1be2a43845ef5654bb381 100644
--- a/third_party/WebKit/Source/core/html/ListedElement.h
+++ b/third_party/WebKit/Source/core/html/ListedElement.h
@@ -26,6 +26,7 @@
 #define ListedElement_h
 
 #include "core/CoreExport.h"
+#include "core/html/FormAssociated.h"
 #include "platform/heap/Handle.h"
 #include "wtf/text/WTFString.h"
 
@@ -41,7 +42,8 @@ class Node;
 class ValidityState;
 
 // https://html.spec.whatwg.org/multipage/forms.html#category-listed
-class CORE_EXPORT ListedElement : public GarbageCollectedMixin {
+class CORE_EXPORT ListedElement : public GarbageCollectedMixin,
+                                  public FormAssociated {
  public:
   virtual ~ListedElement();
 
@@ -113,6 +115,8 @@ class CORE_EXPORT ListedElement : public GarbageCollectedMixin {
 
   String customValidationMessage() const;
 
+  void setAssociatedForm(HTMLFormElement*) override;
+
  private:
   void setFormAttributeTargetObserver(FormAttributeTargetObserver*);
   void resetFormAttributeTargetObserver();