Ensure tests have an active task runner

chrome/browser/chromeos/power/power_prefs_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/chromeos/power/power_prefs.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 14 matching lines @@
 #include "chrome/test/base/testing_pref_service_syncable.h"
 #include "chrome/test/base/testing_profile.h"
 #include "chrome/test/base/testing_profile_manager.h"
 #include "chromeos/dbus/fake_power_manager_client.h"
 #include "chromeos/dbus/power_manager/policy.pb.h"
 #include "chromeos/dbus/power_policy_controller.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace chromeos {
 
 class PowerPrefsTest : public testing::Test {
  protected:
   // Screen lock state that determines which delays are used by
   // GetExpectedPowerPolicyForProfile().
   enum ScreenLockState {
     LOCKED,
     UNLOCKED,
   };
 
   PowerPrefsTest();
 
   // testing::Test:
   void SetUp() override;
   void TearDown() override;
 
   const Profile* GetProfile() const;
 
   std::string GetExpectedPowerPolicyForProfile(
       Profile* profile,
       ScreenLockState screen_lock_state) const;
   std::string GetCurrentPowerPolicy() const;
   bool GetExpectedAllowScreenWakeLocksForProfile(Profile* profile) const;
   bool GetCurrentAllowScreenWakeLocks() const;
 
+  content::TestBrowserThreadBundle thread_bundle_;
   TestingProfileManager profile_manager_;
   PowerPolicyController* power_policy_controller_;     // Not owned.
   scoped_ptr<FakePowerManagerClient> fake_power_manager_client_;
 
   scoped_ptr<PowerPrefs> power_prefs_;
 
   DISALLOW_COPY_AND_ASSIGN(PowerPrefsTest);
 };
 
 PowerPrefsTest::PowerPrefsTest()
@@ skipping 220 matching lines @@
                         content::Source<Profile>(user_profile),
                         content::NotificationService::NoDetails());
 
   // The user profile's prefs should still be used.
   EXPECT_FALSE(GetProfile());
   EXPECT_EQ(GetExpectedPowerPolicyForProfile(user_profile, UNLOCKED),
             GetCurrentPowerPolicy());
 }
 
 }  // namespace chromeos