Automated IWYU fix for TaskRunner includes.

chromecast/base/alarm_manager.cc

 // Copyright 2017 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 "chromecast/base/alarm_manager.h"
 
 #include "base/memory/ptr_util.h"
+#include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/default_clock.h"
 #include "base/timer/timer.h"
 
 #define MAKE_SURE_OWN_THREAD(callback, ...)                                \
   if (!task_runner_->BelongsToCurrentThread()) {                           \
     task_runner_->PostTask(                                                \
         FROM_HERE, base::Bind(&AlarmManager::callback,                     \
                               weak_factory_.GetWeakPtr(), ##__VA_ARGS__)); \
     return;                                                                \
@@ skipping 65 matching lines @@
   base::Time now = clock_->Now();
   // Fire appropriate alarms.
   while ((!next_alarm_.empty()) && now >= next_alarm_.top()->time()) {
     next_alarm_.top()->task_runner()->PostTask(FROM_HERE,
                                                next_alarm_.top()->task());
     next_alarm_.pop();
   }
 }
 
 }  // namespace chromecast