New interface and function for form association

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

Index: third_party/WebKit/Source/core/html/HTMLImageElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLImageElement.h b/third_party/WebKit/Source/core/html/HTMLImageElement.h
index 1bc5c0cd1c677c4b104b4df99b2b9fc23ca74200..884a8b3e3bc289e59ad35537221e44199c9d17df 100644
--- a/third_party/WebKit/Source/core/html/HTMLImageElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLImageElement.h
@@ -27,6 +27,7 @@
 #include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "core/fetch/FetchRequest.h"
+#include "core/html/FormAssociated.h"
 #include "core/html/HTMLElement.h"
 #include "core/html/HTMLImageLoader.h"
 #include "core/html/canvas/CanvasImageSource.h"
@@ -44,7 +45,8 @@ class ImageBitmapOptions;
 class CORE_EXPORT HTMLImageElement final : public HTMLElement,
                                            public CanvasImageSource,
                                            public ImageBitmapSource,
-                                           public ActiveScriptWrappable {
+                                           public ActiveScriptWrappable,
+                                           public FormAssociated {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(HTMLImageElement);
 
@@ -140,6 +142,9 @@ class CORE_EXPORT HTMLImageElement final : public HTMLElement,
                                   const ImageBitmapOptions&,
                                   ExceptionState&) override;
 
+  FormAssociated* toFormAssociatedOrNull() override { return this; };
+  void associateWith(HTMLFormElement*) override;
+
  protected:
   explicit HTMLImageElement(Document&,
                             HTMLFormElement* = 0,