New tabCapture.captureOffscreenTab API, initially for Presentation API 1UA mode

chrome/test/data/extensions/api_test/tab_capture/offscreen_evil_tests.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.
+
+// Waits until content sampled from |stream| indicates a success or fail status
+// from an off-screen tab page that renders a green (success) or red (fail)
+// color fill.
+function waitForGreenOrRedTestResultAndEndTest(stream) {
+  waitForAnExpectedColor(stream, [[255, 0, 0], [0, 255, 0]], 64,
+      function (result) {
+        stopAllTracks(stream);
+        if (result == 1) {
+          chrome.test.succeed();
+        } else {
+          // Fail after 3 seconds to allow examining the debug error message.
+          setTimeout(function () { chrome.test.fail(); }, 3000);
+        }
+      }
+  );
+}
+
+chrome.test.runTests([
+  function cannotAccessLocalResources() {
+    chrome.tabCapture.captureOffscreenTab(
+      makeDataUriFromDocument(makeOffscreenTabTestDocument(
+          'function failIfIsLoadable(url, runNextTest) {\n' +
+          '  var request = new XMLHttpRequest();\n' +
+          '  request.open("GET", url);\n' +
+          '  request.addEventListener("load", function () {\n' +
+          '    setDebugMessage(url);\n' +
+          '    setFillColor(redColor);\n' +
+          '  });\n' +
+          '  request.addEventListener("error", function () {\n' +
+          '    setTimeout(runNextTest, 0);\n' +
+          '  });' +
+          '  request.send();\n' +
+          '}\n' +
+          '\n' +
+          'failIfIsLoadable("file://something", function () {\n' +
+          '  failIfIsLoadable("chrome-extension://' + chrome.runtime.id +
+                             '/offscreen_evil_tests.js", function() {\n' +
+          '    setFillColor(greenColor);\n' +
+          '  });\n' +
+          '});')),
+      getCaptureOptions(),
+      waitForGreenOrRedTestResultAndEndTest);
+  },
+
+  function cannotOpenNewTabsOrDialogs() {
+    chrome.tabCapture.captureOffscreenTab(
+      makeDataUriFromDocument(makeOffscreenTabTestDocument(
+          'var wnd = window.open("data:text/html;charset=UTF-8,NOT SEEN");\n' +
+          'if (wnd) {\n' +
+          '  setDebugMessage("window.open() succeeded");\n' +
+          '  setFillColor(redColor);\n' +
+          '} else {\n' +
+          '  var result = window.confirm("Can you see me?");\n' +
+          '  if (result) {\n' +
+          '    setDebugMessage("positive confirm result");\n' +
+          '    setFillColor(redColor);\n' +
+          '  } else {\n' +
+          '    setFillColor(greenColor);\n' +
+          '  }\n' +
+          '}')),
+      getCaptureOptions(),
+      waitForGreenOrRedTestResultAndEndTest);
+  },
+
+  function cannotGetUserMedia() {
+    chrome.tabCapture.captureOffscreenTab(
+      makeDataUriFromDocument(makeOffscreenTabTestDocument(
+          'navigator.webkitGetUserMedia(\n' +
+          '  {video: true},\n' +
+          '  function onSuccess(stream) { setFillColor(redColor); },\n' +
+          '  function onFailure(error) { setFillColor(greenColor); });')),
+      getCaptureOptions(),
+      waitForGreenOrRedTestResultAndEndTest);
+  },
+
+  // NOTE: Before adding any more tests, the maximum off-screen tab limit would
+  // have to be increased (or a design issue resolved).  This is because
+  // off-screen tabs are not closed the instant the LocalMediaStream is stopped,
+  // but approximately 1 second later.
+
+]);