Componentize autofill dialog common code

components/autofill/core/browser/dialog_section.h

+// Copyright 2015 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 COMPONENTS_AUTOFILL_CORE_BROWSER_DIALOG_SECTION_H_
+#define COMPONENTS_AUTOFILL_CORE_BROWSER_DIALOG_SECTION_H_
+
+namespace autofill {
+
+// Sections of the dialog --- all fields that may be shown to the user fit under
+// one of these sections.
+enum DialogSection {
+  // Lower boundary value for looping over all sections.
+  SECTION_MIN,
+
+  // The Autofill-backed dialog uses separate CC and billing sections.
+  SECTION_CC = SECTION_MIN,
+  SECTION_BILLING,
+  // The wallet-backed dialog uses a combined CC and billing section.
+  SECTION_CC_BILLING,
+  SECTION_SHIPPING,
+
+  // Upper boundary value for looping over all sections.
+  SECTION_MAX = SECTION_SHIPPING,
+};
+
+}  // namespace autofill
+
+#endif // COMPONENTS_AUTOFILL_CORE_BROWSER_DIALOG_SECTION_H_