TaskScheduler: Set the current SequenceToken when a Task runs.

base/task_scheduler/scheduler_worker.cc

 // Copyright 2016 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/task_scheduler/scheduler_worker.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 37 matching lines @@
             DCHECK_EQ(detached_thread.get(), this);
             PlatformThread::Detach(thread_handle_);
             outer_ = nullptr;
             break;
           }
         }
         WaitForWork();
         continue;
       }
 
-      outer_->task_tracker_->RunTask(sequence->PeekTask());
+      outer_->task_tracker_->RunNextTaskInSequence(sequence.get());
 
       const bool sequence_became_empty = sequence->PopTask();
 
       // If |sequence| isn't empty immediately after the pop, re-enqueue it to
       // maintain the invariant that a non-empty Sequence is always referenced
       // by either a PriorityQueue or a SchedulerWorker. If it is empty
       // and there are live references to it, it will be enqueued when a Task is
       // added to it. Otherwise, it will be destroyed at the end of this scope.
       if (!sequence_became_empty)
         outer_->delegate_->ReEnqueueSequence(std::move(sequence));
@@ skipping 144 matching lines @@
   CreateThread();
 }
 
 bool SchedulerWorker::ShouldExitForTesting() const {
   AutoSchedulerLock auto_lock(should_exit_for_testing_lock_);
   return should_exit_for_testing_;
 }
 
 }  // namespace internal
 }  // namespace base