Add billing address as a mandatory field of Payments credit cards.

components/autofill/core/browser/address_combobox_model.h

Index: components/autofill/core/browser/address_combobox_model.h
diff --git a/components/autofill/core/browser/address_combobox_model.h b/components/autofill/core/browser/address_combobox_model.h
new file mode 100644
index 0000000000000000000000000000000000000000..0ee29849ab75f1b0549e1bd3d19a3afad9c125b1
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+++ b/components/autofill/core/browser/address_combobox_model.h
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+// Copyright 2017 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_ADDRESS_COMBOBOX_MODEL_H_
+#define COMPONENTS_AUTOFILL_CORE_BROWSER_ADDRESS_COMBOBOX_MODEL_H_
+
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/observer_list.h"
+#include "base/strings/string16.h"
+#include "ui/base/models/combobox_model.h"
+
+namespace autofill {
+
+class AutofillProfile;
+class PersonalDataManager;
+
+// A combobox model for listing addresses by a generated user visible string and
+// have a unique id to identify the one selected by the user.
+class AddressComboboxModel : public ui::ComboboxModel {
+ public:
+  // Enumerate the profiles from |personal_data_manager| to expose them in a
+  // combobox using |app_locale| for proper format.
+  AddressComboboxModel(const PersonalDataManager& personal_data_manager,
+                       const std::string& app_locale);
+  ~AddressComboboxModel() override;
+
+  // ui::ComboboxModel implementation:
+  int GetItemCount() const override;
+  base::string16 GetItemAt(int index) override;
+  bool IsItemSeparatorAt(int index) override;
+  void AddObserver(ui::ComboboxModelObserver* observer) override;
+  void RemoveObserver(ui::ComboboxModelObserver* observer) override;
+
+  // Adds |profile| to model and return its combobox index.
+  int AddNewProfile(const AutofillProfile& profile);
+
+  // Returns the unique identifier of the profile at |index|, unless |index|
+  // refers to a special entry, in which case an empty string is returned.
+  std::string GetItemIdentifierAt(int index);
+
+  // Returns the combobox index of the item with the given id or -1 if it's not
+  // found.
+  int GetIndexOfIdentifier(const std::string& identifier);
+
+ private:
+  // Update |addresses_| based on |profiles_cache_| and notify observers.
+  void UpdateAddresses();
+
+  // List of <id, user visible string> pairs for the addresses extracted from
+  // the |personal_data_manager| passed in the constructor.
+  std::vector<std::pair<std::string, base::string16>> addresses_;
+
+  // A cached copy of all profiles to allow rebuilding the differentiating
+  // labels when new profiles are added.
+  std::vector<std::unique_ptr<AutofillProfile>> profiles_cache_;
+
+  // Application locale, also needed when a new profile is added.
+  std::string app_locale_;
+
+  // To be called when the data for the given country code was loaded.
+  base::ObserverList<ui::ComboboxModelObserver> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(AddressComboboxModel);
+};
+
+}  // namespace autofill
+
+#endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_ADDRESS_COMBOBOX_MODEL_H_