Add JavaScript prompts support to CWVUIDelegate.

ios/web_view/internal/web_view_java_script_dialog_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_WEB_VIEW_INTERNAL_WEB_VIEW_JAVA_SCRIPT_DIALOG_PRESENTER_H_
+#define IOS_WEB_VIEW_INTERNAL_WEB_VIEW_JAVA_SCRIPT_DIALOG_PRESENTER_H_
+
+#import "base/ios/weak_nsobject.h"
+#include "ios/web/public/java_script_dialog_presenter.h"
+
+@class CWVWebView;
+@protocol CWVUIDelegate;
+
+class WebViewJavaScriptDialogPresenter : public web::JavaScriptDialogPresenter {

[Eugene But (OOO till 7-30), 2017/02/27 18:30:52]

Please add comments to all non-trirvial interfaces.

[michaeldo, 2017/02/27 21:35:51]

Done.

+ public:
+  WebViewJavaScriptDialogPresenter(CWVWebView* web_view,
+                                   id<CWVUIDelegate> ui_delegate);
+  ~WebViewJavaScriptDialogPresenter();
+

[Eugene But (OOO till 7-30), 2017/02/27 18:30:52]

// web::JavaScriptDialogPresenter overrides:

[michaeldo, 2017/02/27 21:35:51]

Done.

+  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;
+
+  void SetUIDelegate(id<CWVUIDelegate> ui_delegate);
+
+ private:
+  // The underlying delegate handling the dialog UI.
+  base::WeakNSProtocol<id<CWVUIDelegate>> ui_delegate_;
+  // The web view which originated the dialogs.
+  base::WeakNSObject<CWVWebView> web_view_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebViewJavaScriptDialogPresenter);
+};
+
+#endif  // IOS_WEB_VIEW_INTERNAL_WEB_VIEW_JAVA_SCRIPT_DIALOG_PRESENTER_H_