Hide requests in an extension from other extensions

chrome/test/data/extensions/api_test/webrequest_extensions/main/background.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 requests = [];
+chrome.webRequest.onBeforeRequest.addListener(function(details) {
+  // Show the query string of the request. If this is absent for some
+  // reason (probably an error), show the full URL.
+  requests.push(new URL(details.url).search || details.url);
+}, {
+  types: ['xmlhttprequest'],
+  urls: ['*://*/*']
+});
+
+chrome.test.sendMessage('web_request_status1', echoRequestStatus);
+chrome.test.sendMessage('web_request_status2', echoRequestStatus);
+
+function echoRequestStatus() {
+  if (requests.length === 0) {
+    chrome.test.sendMessage('Did not intercept any requests.');
+  } else {
+    chrome.test.sendMessage('Intercepted requests: ' + requests.join(', '));
+  }
+  requests.length = 0;
+}