Modifying Autofill Agent to use synthetic form (i.e., formless elements) when no form is present on…

components/autofill/content/renderer/autofill_agent.h

Index: components/autofill/content/renderer/autofill_agent.h
diff --git a/components/autofill/content/renderer/autofill_agent.h b/components/autofill/content/renderer/autofill_agent.h
index 0de9b5cb8138344a034f76c4e3a07040940ba77f..0e9043c4c58b1de9ad6be8d068b219c90d6523db 100644
--- a/components/autofill/content/renderer/autofill_agent.h
+++ b/components/autofill/content/renderer/autofill_agent.h
@@ -270,6 +270,10 @@ class AutofillAgent : public content::RenderFrameObserver,
   // Last form which was interacted with by the user.
   blink::WebFormElement last_interacted_form_;
 
+  // When dealing with forms that don't use a <form> tag, we keep track of the
+  // elements the user has modified so we can determine when submission occurs.
+  std::set<blink::WebFormControlElement> formless_elements_user_edited_;
+
   // Was the query node autofilled prior to previewing the form?
   bool was_query_node_autofilled_;