Implement <webview>.addContentScript/removeContentScript API [1]

extensions/renderer/resources/guest_view/web_view_experimental.js

 // Copyright 2014 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 experimental API for <webview>.
 // See web_view.js for details.
 //
 // <webview> Experimental API is only available on canary and dev channels of
 // Chrome.
 
@@ skipping 12 matching lines @@
       this.guest.getId(), dataUrl, baseUrl, virtualUrl, function() {
         // Report any errors.
         if (chrome.runtime.lastError != undefined) {
           window.console.error(
               'Error while running webview.loadDataWithBaseUrl: ' +
                   chrome.runtime.lastError.message);
         }
       });
 };
 
+WebViewImpl.prototype.addContentScripts = function() {
+  if (!this.guest.getId()) {
+    window.console.error(WebViewConstants.ERROR_MSG_CANNOT_INJECT_SCRIPT);
+    return false;
+  }
+  var args = $Array.concat([this.guest.getId()], $Array.slice(arguments));
+  return $Function.apply(WebViewInternal.addContentScripts, null, args);
+};
+
+WebViewImpl.prototype.removeContentScripts = function(var_args) {
+  if (!this.guest.getId()) {
+    window.console.error(WebViewConstants.ERROR_MSG_CANNOT_INJECT_SCRIPT);
+    return false;
+  }
+  var args = $Array.concat([this.guest.getId()], $Array.slice(arguments));
+  return $Function.apply(WebViewInternal.removeContentScripts, null, args);
+};
+
 // An array of <webview>'s experimental API methods. See |WEB_VIEW_API_METHODS|
 // in web_view_api_methods.js for more details.
 var WEB_VIEW_EXPERIMENTAL_API_METHODS = [
-  'loadDataWithBaseUrl'
+  'loadDataWithBaseUrl',
+  'addContentScripts',
+  'removeContentScripts'
 ];
 
 // Registers the experimantal WebVIew API when available.
 WebViewImpl.maybeGetExperimentalApiMethods = function() {
   return WEB_VIEW_EXPERIMENTAL_API_METHODS;
 };