Sending autofill types for username fields in sign-in forms for improving username detection.

components/autofill/core/browser/form_structure.h

Index: components/autofill/core/browser/form_structure.h
diff --git a/components/autofill/core/browser/form_structure.h b/components/autofill/core/browser/form_structure.h
index 235d474600ce2db317266430d8a7adcc2262262c..2890f67278c5d410b71cb7c1a4936533a0905817 100644
--- a/components/autofill/core/browser/form_structure.h
+++ b/components/autofill/core/browser/form_structure.h
@@ -226,6 +226,11 @@ class FormStructure {
 
   bool all_fields_are_passwords() const { return all_fields_are_passwords_; }
 
+  bool is_signin_upload() const { return is_signin_upload_; }
+  void set_is_signin_upload(bool is_signin_upload) {
+    is_signin_upload_ = is_signin_upload;
+  }
+
   FormSignature form_signature() const { return form_signature_; }
 
   // Returns a FormData containing the data this form structure knows about.
@@ -325,6 +330,10 @@ class FormStructure {
   // True if all form fields are password fields.
   bool all_fields_are_passwords_;
 
+  // True if the form is submitted and has 2 fields: one text and one password
+  // field.
+  bool is_signin_upload_;
+
   // The unique signature for this form, composed of the target url domain,
   // the form name, and the form field names in a 64-bit hash.
   FormSignature form_signature_;