DCHECK tasks posted by TaskRunner::PostTask

base/threading/sequenced_worker_pool.cc

Index: base/threading/sequenced_worker_pool.cc
diff --git a/base/threading/sequenced_worker_pool.cc b/base/threading/sequenced_worker_pool.cc
index a5f997fd34dcdc4d1cbc35021d6f8025fc22bee6..98306041f9ae6721b73961188dc413afbd174267 100644
--- a/base/threading/sequenced_worker_pool.cc
+++ b/base/threading/sequenced_worker_pool.cc
@@ -695,6 +695,8 @@ bool SequencedWorkerPool::Inner::PostTask(
     const tracked_objects::Location& from_here,
     Closure task,
     TimeDelta delay) {
+  DCHECK(task);
+
   // TODO(fdoray): Uncomment this DCHECK. It is initially commented to avoid a
   // revert of the CL that adds debug::DumpWithoutCrashing() if it fails on the
   // waterfall. https://crbug.com/622400