feat: add WebContentsView API

lib/browser/api/module-list.js

@@ -24,6 +24,7 @@ module.exports = [
   {name: 'Tray', file: 'tray'},
   {name: 'View', file: 'view'},
   {name: 'webContents', file: 'web-contents'},
+  {name: 'WebContentsView', file: 'web-contents-view'},
   // The internal modules, invisible unless you know their names.
   {name: 'NavigationController', file: 'navigation-controller', private: true}
 ]

lib/browser/api/web-contents-view.js

@@ -0,0 +1,15 @@
+'use strict'
+
+const electron = require('electron')
+
+const {View} = electron
+const {WebContentsView} = process.atomBinding('web_contents_view')
+
+Object.setPrototypeOf(WebContentsView.prototype, View.prototype)
+
+WebContentsView.prototype._init = function () {
+  // Call parent class's _init.
+  View.prototype._init.call(this)
+}
+
+module.exports = WebContentsView