<webview>: Implement dialog API

content/common/browser_plugin/browser_plugin_message_enums.h

 // Copyright 2013 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 CONTENT_COMMON_BROWSER_PLUGIN_BROWSER_PLUGIN_MESSAGE_ENUMS_H_
 #define CONTENT_COMMON_BROWSER_PLUGIN_BROWSER_PLUGIN_MESSAGE_ENUMS_H_
 
 enum BrowserPluginPermissionType {
   // Unknown type of permission request.
   BrowserPluginPermissionTypeUnknown,
 
   // Download.
   BrowserPluginPermissionTypeDownload,
 
   // Geolocation.
   BrowserPluginPermissionTypeGeolocation,
 
   // Media access (audio/video) permission request type.
   BrowserPluginPermissionTypeMedia,
 
   // PointerLock
   BrowserPluginPermissionTypePointerLock,
 
 
   // New window requests.
   // Note: Even though new windows don't use the permission API, the new window
   // API is sufficiently similar that it's convenient to consider it a
   // permission type for code reuse.
   BrowserPluginPermissionTypeNewWindow,
+
+  // JavaScript Dialogs: prompt, alert, confirm
+  // Note: Even through dialogs do not use the permission API, the dialog API
+  // is sufficiently similiar that it's convenient to consider it a permission
+  // type for code reuse.
+  BrowserPluginPermissionTypeJavaScriptDialog
 };
 
 #endif  // CONTENT_COMMON_BROWSER_PLUGIN_BROWSER_PLUGIN_MESSAGE_ENUMS_H_