Allow tabCapture API to be granted for chrome:// pages.

chrome/test/data/extensions/api_test/tab_capture/experimental/active_tab_chrome_pages.js

Index: chrome/test/data/extensions/api_test/tab_capture/experimental/active_tab_chrome_pages.js
diff --git a/chrome/test/data/extensions/api_test/tab_capture/experimental/active_tab_chrome_pages.js b/chrome/test/data/extensions/api_test/tab_capture/experimental/active_tab_chrome_pages.js
new file mode 100644
index 0000000000000000000000000000000000000000..b96d1f274d446409ad7e693b08ede2e53fb25298
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/tab_capture/experimental/active_tab_chrome_pages.js
@@ -0,0 +1,14 @@
+// Copyright (c) 2013 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 afterTabOpened = function() {
+  chrome.tabCapture.capture({audio: true, video: true}, function(stream) {
+    chrome.test.assertTrue(!!stream);
+    stream.stop();
+    chrome.test.succeed();
+  });
+};
+
+chrome.test.notifyPass();
+chrome.test.sendMessage('ready1', afterTabOpened);