DCHECK tasks posted by TaskRunner::PostTask

content/renderer/categorized_worker_pool.cc

 // Copyright 2015 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 "content/renderer/categorized_worker_pool.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 45 matching lines @@
                        base::Closure task,
                        base::TimeDelta delay) override {
     return PostNonNestableDelayedTask(from_here, std::move(task), delay);
   }
   bool RunsTasksOnCurrentThread() const override { return true; }
 
   // Overridden from base::SequencedTaskRunner:
   bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
                                   base::Closure task,
                                   base::TimeDelta delay) override {
+    DCHECK(task);
     base::AutoLock lock(lock_);
 
     // Remove completed tasks.
     DCHECK(completed_tasks_.empty());
     task_graph_runner_->CollectCompletedTasks(namespace_token_,
                                               &completed_tasks_);
 
     tasks_.erase(tasks_.begin(), tasks_.begin() + completed_tasks_.size());
 
     tasks_.push_back(make_scoped_refptr(new ClosureTask(std::move(task))));
@@ skipping 342 matching lines @@
     : closure_(std::move(closure)) {}
 
 // Overridden from cc::Task:
 void CategorizedWorkerPool::ClosureTask::RunOnWorkerThread() {
   std::move(closure_).Run();
 }
 
 CategorizedWorkerPool::ClosureTask::~ClosureTask() {}
 
 }  // namespace content