<webview>: Implement WebRequest API

chrome/renderer/resources/extensions/web_view_experimental.js

 // 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.
 
 // Shim extension to provide permission request API (and possibly other future
 // experimental APIs) for <webview> tag.
 // See web_view.js for details.
 //
 // We want to control the permission API feature in <webview> separately from
 // the <webview> feature itself. <webview> is available in stable channel, but
 // permission API would only be available for channels CHANNEL_DEV and
 // CHANNEL_CANARY.
 
 var WebView = require('webView').WebView;
-
+var GetExtensionAPIDefinitions =
+      requireNative('apiDefinitions').GetExtensionAPIDefinitions;
+var WebRequestEvent = require('webRequest').WebRequestEvent;
 var forEach = require('utils').forEach;
 
 /** @type {Array.<string>} */
 var PERMISSION_TYPES = ['download', 'media', 'geolocation', 'pointerLock'];
 
 /** @type {string} */
 var REQUEST_TYPE_NEW_WINDOW = 'newwindow';
 
 /** @type {string} */
 var ERROR_MSG_PERMISSION_ALREADY_DECIDED = '<webview>: ' +
@@ skipping 152 matching lines @@
     objectNode['-internal-persistObject'](
         window, detail.permission, requestId);
 
     var defaultPrevented = !node.dispatchEvent(evt);
     if (!actionTaken && !defaultPrevented) {
       actionTaken = true;
       // The default action is to discard the window.
       objectNode['-internal-setPermission'](requestId, false);
     }
   });
+}
+
+/**
+ * @private
+ */
+WebView.prototype.maybeSetupWebRequestEvents_ = function() {
+  var self = this;
+  // Populate the WebRequest events from the API definition.
+  var webRequestDefinition = GetExtensionAPIDefinitions().filter(function(api) {
+    return api.namespace == 'webRequest';
+  })[0];
+  for (var i = 0; i < webRequestDefinition.events.length; ++i) {
+    Object.defineProperty(self.node_, webRequestDefinition.events[i].name, {
+      get: function(webRequestEvent) {
+        return function() {
+          if (!self[webRequestEvent.name + '_']) {
+            self[webRequestEvent.name + '_'] =
+                new WebRequestEvent(
+                    'webview.' + webRequestEvent.name,
+                    webRequestEvent.parameters,
+                    webRequestEvent.extraParameters, null,
+                    self.objectNode_.getInstanceId());
+          }
+          return self[webRequestEvent.name + '_'];
+        }
+      }(webRequestDefinition.events[i]),
+      // No setter.
+      enumerable: true
+    });
+  }
 };