Automated IWYU fix for TaskRunner includes.

chrome/browser/task_manager/sampling/task_group_unittest.cc

 // Copyright 2016 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/task_manager/sampling/task_group.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/sequenced_task_runner.h"
 #include "base/strings/string16.h"
 #include "base/test/gtest_util.h"
 #include "chrome/browser/task_manager/sampling/shared_sampler.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "gpu/ipc/common/memory_stats.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace task_manager {
 
@@ skipping 133 matching lines @@
   ASSERT_FALSE(background_refresh_complete_);
   run_loop_->Run();
 
   EXPECT_TRUE(background_refresh_complete_);
 #endif  // !defined(DISABLE_NACL)
 
   EXPECT_TRUE(task_group_.AreBackgroundCalculationsDone());
 }
 
 }  // namespace task_manager