[Payment Request] Selector view edit mode

ios/chrome/browser/ui/payments/payment_request_selector_view_controller_data_source.h

 // 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 IOS_CHROME_BROWSER_UI_PAYMENTS_PAYMENT_REQUEST_SELECTOR_VIEW_CONTROLLER_DATA_SOURCE_H_
 #define IOS_CHROME_BROWSER_UI_PAYMENTS_PAYMENT_REQUEST_SELECTOR_VIEW_CONTROLLER_DATA_SOURCE_H_
 
 #import <Foundation/Foundation.h>
 
 #import "ios/chrome/browser/ui/payments/cells/payments_has_accessory_type.h"
 
 @class CollectionViewItem;
 
 // The possible states the view controller can be in.
 typedef NS_ENUM(NSUInteger, PaymentRequestSelectorState) {
   // The view controller is in normal state.
   PaymentRequestSelectorStateNormal,
+  // The view controller is in edit state.
+  PaymentRequestSelectorStateEdit,
   // The view controller is in pending state.
   PaymentRequestSelectorStatePending,
   // The view controller is in error state.
   PaymentRequestSelectorStateError,
 };
 
 // The data source for the PaymentRequestSelectorViewController. The data
 // source provides the UI models for the PaymentRequestSelectorViewController
 // to display and keeps track of the selected UI model, if any.
 @protocol PaymentRequestSelectorViewControllerDataSource<NSObject>
 
 // The current state of the view controller.
 @property(nonatomic, readonly) PaymentRequestSelectorState state;
 
 // Index for the currently selected item or NSUIntegerMax if there is none.
 @property(nonatomic, readonly) NSUInteger selectedItemIndex;
 
+// Whether or not the view controller supports edit mode.
+- (BOOL)allowsEditMode;
+
 // The header item to display in the collection, if any.
 - (CollectionViewItem*)headerItem;
 
 // The selectable items to display in the collection.
 - (NSArray<CollectionViewItem<PaymentsHasAccessoryType>*>*)selectableItems;
 
 // The "Add" button item, if any.
 - (CollectionViewItem*)addButtonItem;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_PAYMENTS_PAYMENT_REQUEST_SELECTOR_VIEW_CONTROLLER_DATA_SOURCE_H_