[iOS Clean] Added dialogs UI support.

ios/clean/chrome/browser/ui/dialogs/dialog_mediator.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_CLEAN_CHROME_BROWSER_UI_DIALOGS_DIALOG_MEDIATOR_H_
+#define IOS_CLEAN_CHROME_BROWSER_UI_DIALOGS_DIALOG_MEDIATOR_H_
+
+#import <Foundation/Foundation.h>
+
+@class CommandDispatcher;
+@protocol DialogConsumer;
+
+// Class responsible for setting up a DialogConsumer.

[marq (ping after 24h), 2017/06/14 10:52:15]

Document that this class is expected to be subclassed, and that subclasses must
use the +Internal category, etc,

[kkhorimoto, 2017/06/23 06:24:18]

Done.

+@interface DialogMediator : NSObject
+
+// Designated initializer for a mediator that sets up |consumer|.
+- (instancetype)initWithDispatcher:(CommandDispatcher*)dispatcher
+    NS_DESIGNATED_INITIALIZER;
+- (instancetype)init NS_UNAVAILABLE;
+
+// Supplies UI information to |consumer|.
+- (void)updateConsumer:(id<DialogConsumer>)consumer;
+
+// Called when the corresponding coordinator is started or stopped.
+- (void)dialogWillStart;
+- (void)dialogWillStop;
+
+@end
+
+#endif  // IOS_CLEAN_CHROME_BROWSER_UI_DIALOGS_DIALOG_MEDIATOR_H_