[iOS Clean] Added HTTP authentication dialog support.

ios/clean/chrome/browser/ui/commands/http_auth_dialog_commands.h

Index: ios/clean/chrome/browser/ui/commands/http_auth_dialog_commands.h
diff --git a/ios/clean/chrome/browser/ui/commands/http_auth_dialog_commands.h b/ios/clean/chrome/browser/ui/commands/http_auth_dialog_commands.h
new file mode 100644
index 0000000000000000000000000000000000000000..1565f5785cbc37238f592b847694435d704031a5
--- /dev/null
+++ b/ios/clean/chrome/browser/ui/commands/http_auth_dialog_commands.h
@@ -0,0 +1,18 @@
+// 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_CLEAN_CHROME_BROWSER_UI_COMMANDS_HTTP_AUTH_DIALOG_COMMANDS_H_
+#define IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_HTTP_AUTH_DIALOG_COMMANDS_H_
+
+#import <Foundation/Foundation.h>
+
+// Commands used to manage the dismissal of HTTP authentication dialogs.
+@protocol HTTPAuthDialogDismissalCommands<NSObject>
+// Called when an HTTP authentication dialog is dismissed.  If the dialog was
+// cancelled, nil will be passed as the parameters.
+- (void)dismissHTTPAuthDialogWithUsername:(NSString*)username
+                                 password:(NSString*)password;
+@end
+
+#endif  // IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_HTTP_AUTH_DIALOG_COMMANDS_H_