Persist the choice of AutofillDataModel when using the requestAutocomplete dialog.

chrome/browser/ui/autofill/autofill_dialog_controller_impl.h

Index: chrome/browser/ui/autofill/autofill_dialog_controller_impl.h
diff --git a/chrome/browser/ui/autofill/autofill_dialog_controller_impl.h b/chrome/browser/ui/autofill/autofill_dialog_controller_impl.h
index 60bec1db7112520d1ad9ff553226d5e8faf173f8..3536adaff57f8f003289f36a7dd6fd02ffdb2982 100644
--- a/chrome/browser/ui/autofill/autofill_dialog_controller_impl.h
+++ b/chrome/browser/ui/autofill/autofill_dialog_controller_impl.h
@@ -449,6 +449,20 @@ class AutofillDialogControllerImpl : public AutofillDialogController,
   // in order to fill |form_structure_| and pass data back to the invoking page.
   void FinishSubmit();
 
+  // Writes to prefs the choice of AutofillDataModel for |section|.
+  void PersistAutofillChoice(DialogSection section,
+                             const std::string& guid,
+                             int variant);
+
+  // Reads from prefs the choice of AutofillDataModel for |section|. If there is
+  // no pref for this section, sets the outparams to default values.
+  void GetAutofillChoice(DialogSection section,
+                         std::string* guid,
+                         int* variant);
+
+  // Calculates which AutofillDataModel variant |model| is referring to.
+  size_t GetSelectedVariantForModel(const SuggestionsMenuModel& model);
+
   // Logs metrics when the dialog is submitted.
   void LogOnFinishSubmitMetrics();