<webview>: Implement fullscreen permission for html5 element.requestFullscreen()

extensions/renderer/resources/guest_view/web_view/web_view.js

 // Copyright (c) 2012 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.
 
 // This module implements WebView (<webview>) as a custom element that wraps a
 // BrowserPlugin object element. The object element is hidden within
 // the shadow DOM of the WebView element.
 
 var DocumentNatives = requireNative('document_natives');
 var GuestView = require('guestView').GuestView;
 var GuestViewContainer = require('guestViewContainer').GuestViewContainer;
+var GuestViewInternalNatives = requireNative('guest_view_internal');
 var WebViewConstants = require('webViewConstants').WebViewConstants;
 var WebViewEvents = require('webViewEvents').WebViewEvents;
 var WebViewInternal = require('webViewInternal').WebViewInternal;
 
 // Represents the internal state of <webview>.
 function WebViewImpl(webviewElement) {
   GuestViewContainer.call(this, webviewElement, 'webview');
 
   this.setupWebViewAttributes();
   this.setupElementProperties();
@@ skipping 192 matching lines @@
   if (this.baseUrlForDataUrl) {
     webviewSrc = this.baseUrlForDataUrl;
   }
 
   args = $Array.concat([this.guest.getId(), webviewSrc],
                        $Array.slice(args));
   $Function.apply(func, null, args);
   return true;
 }
 
+// Requests the <webview> element wihtin the embedder to enter fullscreen.
+WebViewImpl.prototype.makeElementFullscreen = function() {
+  GuestViewInternalNatives.RunWithGesture(function() {
+    this.element.webkitRequestFullScreen();
+  }.bind(this));
+};
+
 // Implemented when the ChromeWebView API is available.
 WebViewImpl.prototype.maybeGetChromeWebViewEvents = function() {};
 
 // Implemented when the experimental WebView API is available.
 WebViewImpl.maybeGetExperimentalApiMethods = function() { return []; };
 WebViewImpl.prototype.setupExperimentalContextMenus = function() {};
 
 GuestViewContainer.registerElement(WebViewImpl);
 
 // Exports.
 exports.WebViewImpl = WebViewImpl;