Ensure tests have an active task runner

chrome/browser/apps/app_shim/extension_app_shim_handler_mac_unittest.cc

 // Copyright 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.
 
 #include "chrome/browser/apps/app_shim/extension_app_shim_handler_mac.h"
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/apps/app_shim/app_shim_host_mac.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/browser/notification_service.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "extensions/common/extension.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace apps {
 
 using extensions::Extension;
 typedef extensions::AppWindowRegistry::AppWindowList AppWindowList;
 
 using ::testing::_;
@@ skipping 169 matching lines @@
                            APP_SHIM_LAUNCH_NORMAL,
                            std::vector<base::FilePath>());
   }
 
   void RegisterOnlyLaunch(AppShimHandler::Host* host) {
     handler_->OnShimLaunch(host,
                            APP_SHIM_LAUNCH_REGISTER_ONLY,
                            std::vector<base::FilePath>());
   }
 
+  content::TestBrowserThreadBundle thread_bundle_;
   MockDelegate* delegate_;
   scoped_ptr<TestingExtensionAppShimHandler> handler_;
   base::FilePath profile_path_a_;
   base::FilePath profile_path_b_;
   TestingProfile profile_a_;
   TestingProfile profile_b_;
   FakeHost host_aa_;
   FakeHost host_ab_;
   FakeHost host_bb_;
   FakeHost host_aa_duplicate_;
@@ skipping 174 matching lines @@
       .WillRepeatedly(Return(&profile_a_));
   EXPECT_CALL(*delegate_, LoadProfileAsync(profile_path_a_, _))
       .WillOnce(Invoke(delegate_, &MockDelegate::CaptureLoadProfileCallback));
   NormalLaunch(&host_aa_);
   EXPECT_FALSE(handler_->FindHost(&profile_a_, kTestAppIdA));
   delegate_->RunLoadProfileCallback(profile_path_a_, &profile_a_);
   EXPECT_TRUE(handler_->FindHost(&profile_a_, kTestAppIdA));
 }
 
 }  // namespace apps