DCHECK tasks posted by TaskRunner::PostTask

base/message_loop/incoming_task_queue.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 "base/message_loop/incoming_task_queue.h"
 
 #include <limits>
 #include <utility>
 
 #include "base/location.h"
@@ skipping 45 matching lines @@
       message_loop_scheduled_(false),
       always_schedule_work_(AlwaysNotifyPump(message_loop_->type())),
       is_ready_for_scheduling_(false) {
 }
 
 bool IncomingTaskQueue::AddToIncomingQueue(
     const tracked_objects::Location& from_here,
     Closure task,
     TimeDelta delay,
     bool nestable) {
+  DCHECK(task);
   DLOG_IF(WARNING,
           delay.InSeconds() > kTaskDelayWarningThresholdInSeconds)
       << "Requesting super-long task delay period of " << delay.InSeconds()
       << " seconds from here: " << from_here.ToString();
 
   PendingTask pending_task(from_here, std::move(task),
                            CalculateDelayedRuntime(delay), nestable);
 #if defined(OS_WIN)
   // We consider the task needs a high resolution timer if the delay is
   // more than 0 and less than 32ms. This caps the relative error to
@@ skipping 115 matching lines @@
   // that wants to post a task will be blocked until this thread switches back
   // in and releases |incoming_queue_lock_|.
   if (schedule_work)
     message_loop_->ScheduleWork();
 
   return true;
 }
 
 }  // namespace internal
 }  // namespace base