Edit button makes username editable in the password manager bubble.

chrome/browser/ui/views/passwords/manage_password_items_view.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_PASSWORDS_MANAGE_PASSWORD_ITEMS_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_PASSWORDS_MANAGE_PASSWORD_ITEMS_VIEW_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "components/autofill/core/common/password_form.h"
 #include "ui/views/view.h"
 
+namespace views {
+class Textfield;
+class Label;
+}  // namespace views
+
 class ManagePasswordsBubbleModel;
 
+// Standalone functions for creating username and password views.
+std::unique_ptr<views::Label> GenerateUsernameLabel(
+    const autofill::PasswordForm& form);
+std::unique_ptr<views::Label> GeneratePasswordLabel(
+    const autofill::PasswordForm& form);
+std::unique_ptr<views::Textfield> GenerateUsernameEditable(
+    const autofill::PasswordForm& form);
+
 // A custom view of individual credentials. The view is represented as a table
 // where each row can be in three distinct states:
 //
-// * Present credentials the user may choose to save.
 // * Present already-saved credentials to the user for management.
 // * Offer the user the ability to undo a deletion action.
 class ManagePasswordItemsView : public views::View {
  public:
   ManagePasswordItemsView(
       ManagePasswordsBubbleModel* manage_passwords_bubble_model,
       const std::vector<autofill::PasswordForm>* password_forms);
   ManagePasswordItemsView(
       ManagePasswordsBubbleModel* manage_passwords_bubble_model,
       const autofill::PasswordForm* password_form);
@@ skipping 10 matching lines @@
   // Changes the views according to the state of |password_forms_rows_|.
   void Refresh();
 
   std::vector<std::unique_ptr<PasswordFormRow>> password_forms_rows_;
   ManagePasswordsBubbleModel* model_;
 
   DISALLOW_COPY_AND_ASSIGN(ManagePasswordItemsView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PASSWORDS_MANAGE_PASSWORD_ITEMS_VIEW_H_