Adding ChromeIdentity in ShowSigninCommand.

ios/chrome/browser/ui/commands/show_signin_command.h

 // Copyright 2014 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_COMMANDS_SHOW_SIGNIN_COMMAND_H_
 #define IOS_CHROME_BROWSER_UI_COMMANDS_SHOW_SIGNIN_COMMAND_H_
 
 #import <Foundation/Foundation.h>
 
 #include "components/signin/core/browser/signin_metrics.h"
 #include "ios/chrome/browser/ui/commands/generic_chrome_command.h"
 
+@class ChromeIdentity;
+
 typedef void (^ShowSigninCommandCompletionCallback)(BOOL succeeded);
 
 enum AuthenticationOperation {
   // Operation to cancel the current authentication operation and dismiss any
   // UI presented by this operation.
   AUTHENTICATION_OPERATION_DISMISS,
 
   // Operation to start a re-authenticate operation. The user is presented with
   // the SSOAuth re-authenticate web page.
   AUTHENTICATION_OPERATION_REAUTHENTICATE,
 
   // Operation to start a sign-in operation. The user is presented with the
   // SSOAuth sign in page (SSOAuth account picker or SSOAuth sign-in web page).
   AUTHENTICATION_OPERATION_SIGNIN,
-
-  // Operation to start a sign-in operation based on the first known identity.
-  // The users are presented with the sync confirmation screen.
-  AUTHENTICATION_OPERATION_SIGNIN_PROMO_CONTINUE_AS,
 };
 
 // A command to perform a sign in operation.
 @interface ShowSigninCommand : GenericChromeCommand
 
 // Mark inherited initializer as unavailable to prevent calling it by mistake.
 - (instancetype)initWithTag:(NSInteger)tag NS_UNAVAILABLE;
 
 // Initializes a command to perform the specified operation with a
 // SigninInteractionController and invoke a possibly-nil callback when finished.
 - (instancetype)initWithOperation:(AuthenticationOperation)operation
+                         identity:(ChromeIdentity*)identity
                       accessPoint:(signin_metrics::AccessPoint)accessPoint
                       promoAction:(signin_metrics::PromoAction)promoAction
                          callback:(ShowSigninCommandCompletionCallback)callback
     NS_DESIGNATED_INITIALIZER;
 
-// Initializes a ShowSigninCommand with a nil callback.
+// Initializes a ShowSigninCommand with |identity| and |callback| set to nil.
 - (instancetype)initWithOperation:(AuthenticationOperation)operation
                       accessPoint:(signin_metrics::AccessPoint)accessPoint
                       promoAction:(signin_metrics::PromoAction)promoAction;
 
 // Initializes a ShowSigninCommand with PROMO_ACTION_NO_SIGNIN_PROMO and a nil
 // callback.
 - (instancetype)initWithOperation:(AuthenticationOperation)operation
                       accessPoint:(signin_metrics::AccessPoint)accessPoint;
 
 // The callback to be invoked after the operation is complete.
 @property(copy, nonatomic, readonly)
     ShowSigninCommandCompletionCallback callback;
 
 // The operation to perform during the sign-in flow.
 @property(nonatomic, readonly) AuthenticationOperation operation;
 
+// Chrome identity is only used for the AUTHENTICATION_OPERATION_SIGNIN
+// operation (should be nil otherwise). If the identity is non-nil, the
+// interaction view controller logins using this identity. If the identity is
+// nil, the interaction view controller asks the user to choose an identity or
+// to add a new one.
+@property(nonatomic, readonly) ChromeIdentity* identity;
+
 // The access point of this authentication operation.
 @property(nonatomic, readonly) signin_metrics::AccessPoint accessPoint;
 
 // The user action from the sign-in promo to trigger the sign-in operation.
 @property(nonatomic, readonly) signin_metrics::PromoAction promoAction;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_COMMANDS_SHOW_SIGNIN_COMMAND_H_