<webview>: Workaround to enable webview.contentWindow.postMessage.

chrome/renderer/resources/extensions/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.
 
 // Shim that simulates a <webview> tag via Mutation Observers.
 //
 // The actual tag is implemented via the browser plugin. The internals of this
 // are hidden via Shadow DOM.
 
 var watchForTag = require("tagWatcher").watchForTag;
 
 var WEB_VIEW_ATTRIBUTES = ['src', 'partition'];
 
-var WEB_VIEW_READONLY_ATTRIBUTES = ['contentWindow'];
-
 // All exposed api methods for <webview>, these are forwarded to the browser
 // plugin.
 var WEB_VIEW_API_METHODS = [
   'back',
   'canGoBack',
   'canGoForward',
   'forward',
   'getProcessId',
   'go',
   'reload',
@@ skipping 67 matching lines @@
       },
       set: function(value) {
         objectNode[attributeName] = value;
       },
       enumerable: true
     });
   }, this);
 
   // We cannot use {writable: true} property descriptor because we want dynamic
   // getter value.
-  WEB_VIEW_READONLY_ATTRIBUTES.forEach(function(attributeName) {
-    Object.defineProperty(this.node_, attributeName, {
-      get: function() {
-        // Read these attributes from the plugin <object>.
-        return objectNode[attributeName];
-      },
-      // No setter.
-      enumerable: true
-    })
-  }, this);
+  Object.defineProperty(this.node_, 'contentWindow', {
+    get: function() {
+      // TODO(fsamuel): This is a workaround to enable
+      // contentWindow.postMessage until http://crbug.com/152006 is fixed.
+      return objectNode.contentWindow.self;
+    },
+    // No setter.
+    enumerable: true
+  });
 
   for (var eventName in WEB_VIEW_EVENTS) {
     this.setupEvent_(eventName, WEB_VIEW_EVENTS[eventName]);
   }
 }
 
 /**
  * @private
  */
 WebView.prototype.handleMutation_ = function(mutation) {
@@ skipping 16 matching lines @@
   var node = this.node_;
   this.objectNode_.addEventListener('-internal-' + eventname, function(e) {
     var evt = new Event(eventname);
     var detail = e.detail ? JSON.parse(e.detail) : {};
     attribs.forEach(function(attribName) {
       evt[attribName] = detail[attribName];
     });
     node.dispatchEvent(evt);
   });
 }