[iOS Clean] Added JavaScript dialog support.

ios/clean/chrome/browser/ui/dialogs/java_script_dialogs/java_script_dialog_overlay_presenter.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_JAVA_SCRIPT_WEB_JAVA_SCRIPT_DIALOG_PRESENTER_H_
+#define IOS_CLEAN_CHROME_BROWSER_UI_DIALOGS_JAVA_SCRIPT_WEB_JAVA_SCRIPT_DIALOG_PRESENTER_H_
+
+#import <Foundation/Foundation.h>
+
+#include "ios/web/public/java_script_dialog_presenter.h"
+#import "ios/web/public/web_state/web_state_user_data.h"
+
+class OverlayService;
+
+// A concrete subclass of web::JavaScriptDialogPresenter that is associated with
+// a WebState via its UserData.  It uses OverlayService to present dialogs.
+class JavaScriptDialogOverlayPresenter
+    : public web::JavaScriptDialogPresenter,
+      public web::WebStateUserData<JavaScriptDialogOverlayPresenter> {
+ public:
+  // Factory method for a presenter that uses |overlay_service| to show dialogs.
+  static void CreateForWebState(web::WebState* web_state,
+                                OverlayService* overlay_service);
+
+  ~JavaScriptDialogOverlayPresenter() override;
+
+ private:
+  friend class web::WebStateUserData<JavaScriptDialogOverlayPresenter>;
+  // The WebState with which this presenter is associated.
+  web::WebState* web_state_;
+  // The OverlayService to use for the dialogs.
+  OverlayService* overlay_service_;
+
+  // Private constructor.  New instances should be created via
+  // CreateForWebState() and accessed via FromWebState().
+  explicit JavaScriptDialogOverlayPresenter(web::WebState* web_state,
+                                            OverlayService* overlay_service);
+
+  // JavaScriptDialogPresenter:
+  void RunJavaScriptDialog(web::WebState* web_state,
+                           const GURL& origin_url,
+                           web::JavaScriptDialogType dialog_type,
+                           NSString* message_text,
+                           NSString* default_prompt_text,
+                           const web::DialogClosedCallback& callback) override;
+  void CancelDialogs(web::WebState* web_state) override;
+
+  DISALLOW_COPY_AND_ASSIGN(JavaScriptDialogOverlayPresenter);
+};
+
+#endif  // IOS_CLEAN_CHROME_BROWSER_UI_DIALOGS_JAVA_SCRIPT_WEB_JAVA_SCRIPT_DIALOG_PRESENTER_H_