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

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

Index: extensions/renderer/resources/guest_view/web_view/web_view.js
diff --git a/extensions/renderer/resources/guest_view/web_view/web_view.js b/extensions/renderer/resources/guest_view/web_view/web_view.js
index a69736bab5445a39fba8eda52d00ee8c911e0878..c061c8387c3e4d403c7e4b7778551fc54b0cea04 100644
--- a/extensions/renderer/resources/guest_view/web_view/web_view.js
+++ b/extensions/renderer/resources/guest_view/web_view/web_view.js
@@ -9,6 +9,7 @@
 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;
@@ -216,6 +217,13 @@ WebViewImpl.prototype.executeCode = function(func, 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.maybeSetupContextMenus = function() {};