Ensure tests have an active task runner

chrome/browser/extensions/warning_badge_service_unittest.cc

 // Copyright (c) 2012 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/extensions/warning_badge_service.h"
 
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/global_error/global_error_service.h"
 #include "chrome/browser/ui/global_error/global_error_service_factory.h"
 #include "chrome/test/base/testing_profile.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "extensions/browser/warning_service.h"
 #include "extensions/browser/warning_set.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace extensions {
 
 namespace {
 
 class TestExtensionWarningSet : public WarningService {
  public:
@@ skipping 30 matching lines @@
 }
 
 const char ext1_id[] = "extension1";
 const char ext2_id[] = "extension2";
 
 }  // namespace
 
 // Check that no badge appears if it has been suppressed for a specific
 // warning.
 TEST(WarningBadgeServiceTest, SuppressBadgeForCurrentWarnings) {
+  content::TestBrowserThreadBundle thread_bundle;
   TestingProfile profile;
   TestExtensionWarningSet warnings(&profile);
   TestWarningBadgeService badge_service(&profile, &warnings);
   warnings.AddObserver(&badge_service);
 
   // Insert first warning.
   warnings.AddWarning(Warning::CreateNetworkDelayWarning(ext1_id));
   EXPECT_TRUE(HasBadge(&profile));
 
   // Suppress first warning.
@@ skipping 11 matching lines @@
   EXPECT_FALSE(HasBadge(&profile));
 
   // Set second warning and verify that it shows a badge.
   warnings.AddWarning(Warning::CreateNetworkConflictWarning(ext2_id));
   EXPECT_TRUE(HasBadge(&profile));
 
   warnings.RemoveObserver(&badge_service);
 }
 
 }  // namespace extensions