[iOS Clean] Added dialogs UI support.

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

Index: ios/clean/chrome/browser/ui/commands/dialog_commands.h
diff --git a/ios/clean/chrome/browser/ui/commands/dialog_commands.h b/ios/clean/chrome/browser/ui/commands/dialog_commands.h
new file mode 100644
index 0000000000000000000000000000000000000000..e1204190ac7e2fc1c1ca238477dad38f7fc2aba6
--- /dev/null
+++ b/ios/clean/chrome/browser/ui/commands/dialog_commands.h
@@ -0,0 +1,23 @@
+// 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_DIALOG_COMMANDS_H_
+#define IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_DIALOG_COMMANDS_H_
+
+#import <Foundation/Foundation.h>
+
+// Command protocol for dismissing DialogConsumers.
+@protocol DialogDismissalCommands
+
+// Called to dismiss the dialog.  |buttonID| is the identifier of the
+// DialogButtonConfiguration corresponding with the dialog button that was
+// tapped, if any.  |textFieldValues| contains the user input text.  The keys
+// are the identifiers of the DialogTextFieldConfigurations passed to the
+// consumer, and the values are the text in their corresponding text fields.
+- (void)dismissDialogWithButtonID:(id)buttonID
+                  textFieldValues:(NSDictionary<id, NSString*>*)textFieldValues;
+
+@end
+
+#endif  // IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_DIALOG_COMMANDS_H_