Add signin_metrics::AccessPoint to ShowSigninCommand.

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

 // 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.
 
 #import "ios/chrome/browser/ui/commands/show_signin_command.h"
 
 #include "base/logging.h"
 #include "base/mac/scoped_block.h"
 #include "ios/chrome/browser/ui/commands/ios_command_ids.h"
 
 @implementation ShowSigninCommand {
   base::mac::ScopedBlock<ShowSigninCommandCompletionCallback> _callback;
 }
 
 @synthesize operation = _operation;
 @synthesize signInSource = _signInSource;
+@synthesize signInAccessPoint = _signInAccessPoint;
 
 - (instancetype)initWithTag:(NSInteger)tag {
   NOTREACHED();
   return nil;
 }
 
 - (instancetype)initWithOperation:(AuthenticationOperation)operation
                      signInSource:(SignInSource)signInSource
                          callback:
                              (ShowSigninCommandCompletionCallback)callback {
   if ((self = [super initWithTag:IDC_SHOW_SIGNIN_IOS])) {
     _operation = operation;
     _signInSource = signInSource;
     _callback.reset(callback, base::scoped_policy::RETAIN);
   }
   return self;
 }
 
 - (instancetype)initWithOperation:(AuthenticationOperation)operation
                      signInSource:(SignInSource)signInSource {
   return
       [self initWithOperation:operation signInSource:signInSource callback:nil];
 }
 
+- (instancetype)initWithOperation:(AuthenticationOperation)operation
+                signInAccessPoint:(signin_metrics::AccessPoint)signInAccessPoint
+                         callback:
+                             (ShowSigninCommandCompletionCallback)callback {
+  if ((self = [self initWithOperation:operation
+                         signInSource:SIGN_IN_SOURCE_OTHER
+                             callback:callback])) {
+    _signInAccessPoint = signInAccessPoint;
+  }
+  return self;
+}
+
+- (instancetype)initWithOperation:(AuthenticationOperation)operation
+                signInAccessPoint:
+                    (signin_metrics::AccessPoint)signInAccessPoint {
+  return [self initWithOperation:operation
+               signInAccessPoint:signInAccessPoint
+                        callback:nil];
+}
+
 - (ShowSigninCommandCompletionCallback)callback {
   return _callback.get();
 }
 
 @end