Implement <webview>.addContentScript/removeContentScript API [3]

chrome/test/data/webui/webview_content_script_test.js

 // Copyright 2015 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.
 
 var request_to_comm_channel_1 = 'connect';
 var request_to_comm_channel_2 = 'connect_request';
 var response_from_comm_channel_1 = 'connected';
 var response_from_comm_channel_2 = 'connected_response';
 
 function createWebview() {
@@ skipping 418 matching lines @@
       console.log('Step 5: check the result of content script injected again.');
       webview.executeScript({
         code: 'document.body.style.backgroundColor;'
       }, onGetBackgroundExecuted);
     }
   });
 
   webview.src = url;
   document.body.appendChild(webview);
 }
+
+function testAddContentScriptWithCode(url) {
+  var webview = document.createElement('webview');
+
+  console.log("Step 1: call <webview>.addContentScripts.");
+  webview.addContentScripts(
+      [{"name": 'myrule',
+        "matches": ['http://*/empty*'],
+        "code": 'document.body.style.backgroundColor = \'red\';',
+        "run_at": 'document_end'}]);
+
+  webview.addEventListener('loadstop', function() {
+    console.log('Step 2: call webview.executeScript() to check result.')
+    webview.executeScript({
+      code: 'document.body.style.backgroundColor;'
+    }, onGetBackgroundExecuted);
+  });
+
+  webview.src = url;
+  document.body.appendChild(webview);
+}