test IWYU fixups for base

base/tracked_objects_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.
 
 // Test of classes in the tracked_objects.h classes.
 
 #include "base/tracked_objects.h"
 
+#include <stddef.h>
+
 #include "base/memory/scoped_ptr.h"
 #include "base/process/process_handle.h"
 #include "base/time/time.h"
+#include "base/tracking_info.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 const int kLineNumber = 1776;
 const char kFile[] = "FixedUnitTestFileName";
 const char kWorkerThreadName[] = "WorkerThread-1";
 const char kMainThreadName[] = "SomeMainThreadName";
 const char kStillAlive[] = "Still_Alive";
 
 namespace tracked_objects {
 
@@ skipping 550 matching lines @@
   EXPECT_EQ(0, process_data.tasks[1].death_data.run_duration_sample);
   EXPECT_EQ(0, process_data.tasks[1].death_data.queue_duration_sum);
   EXPECT_EQ(0, process_data.tasks[1].death_data.queue_duration_max);
   EXPECT_EQ(0, process_data.tasks[1].death_data.queue_duration_sample);
   EXPECT_EQ(kStillAlive, process_data.tasks[1].death_thread_name);
   EXPECT_EQ(0u, process_data.descendants.size());
   EXPECT_EQ(base::GetCurrentProcId(), process_data.process_id);
 }
 
 }  // namespace tracked_objects