Support javascript gtests in an extension background page.

chrome/browser/resources/chromeos/chromevox2/cvox2/background/background.extjs

+// 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.
+
+// Include test fixture.
+GEN_INCLUDE(['../../../chromevox/testing/chromevox_unittest_base.js']);
+
+/**
+ * Test fixture for cvox2.Background.
+ * @constructor
+ * @extends {ChromeVoxUnitTestBase}
+ */
+function BackgroundTest() {}
+
+BackgroundTest.prototype = {
+  __proto__: ChromeVoxUnitTestBase.prototype,
+
+  /** @override */
+  browsePreload: null,
+
+  /** @override */
+  testGenCppIncludes: function() {
+    GEN_BLOCK(function() {/*!
+#include "ash/accessibility_delegate.h"
+#include "base/bind.h"
+#include "base/callback.h"
+#include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
+#include "chrome/common/extensions/extension_constants.h"
+    */});
+  },
+
+  /** @override */
+  testGenPreamble: function() {
+    GEN_BLOCK(function() {/*!
+  if (chromeos::AccessibilityManager::Get()->IsSpokenFeedbackEnabled()) {
+    chromeos::AccessibilityManager::Get()->EnableSpokenFeedback(false,
+        ash::A11Y_NOTIFICATION_NONE);
+  }
+
+  base::Closure load_cb =
+      base::Bind(&chromeos::AccessibilityManager::EnableSpokenFeedback,
+          base::Unretained(chromeos::AccessibilityManager::Get()),
+          true,
+          ash::A11Y_NOTIFICATION_NONE);
+  WaitForExtension(extension_misc::kChromeVoxExtensionId, load_cb);
+    */});
+  }
+};
+
+/** Tests ChromeVox classic is in this context. */
+TEST_F('BackgroundTest', 'ClassicNamespaces', function() {
+  assertEquals('object', typeof(cvox));
+  assertEquals('function', typeof(cvox.ChromeVoxBackground));
+});