TaskScheduler [11] Support ExecutionMode::SINGLE_THREADED.

base/task_scheduler/scheduler_thread_pool_interface.h

Index: base/task_scheduler/scheduler_thread_pool_interface.h
diff --git a/base/task_scheduler/scheduler_thread_pool_interface.h b/base/task_scheduler/scheduler_thread_pool_interface.h
index 3339849e00a88bd5234088cb9bc63f931d998776..adbb0d79270dbec1a4038e8e47e93845bc5fbaf9 100644
--- a/base/task_scheduler/scheduler_thread_pool_interface.h
+++ b/base/task_scheduler/scheduler_thread_pool_interface.h
@@ -15,16 +15,22 @@
 namespace base {
 namespace internal {
 
+class SchedulerWorkerThread;
+
 // Interface for a thread pool.
 class BASE_EXPORT SchedulerThreadPoolInterface {
  public:
   virtual ~SchedulerThreadPoolInterface() = default;
 
-  // Posts |task| to be executed by this thread pool as part of |sequence|. The
-  // scheduler's TaskTracker must have allowed |task| to be posted before this
-  // is called. This must only be called after |task|'s delayed run time.
-  virtual void PostTaskWithSequenceNow(std::unique_ptr<Task> task,
-                                       scoped_refptr<Sequence> sequence) = 0;
+  // Posts |task| to be executed as part of |sequence|. |task| will run on
+  // |worker_thread| if specified; otherwise it can run on a any thread owned by
+  // this pool. The scheduler's TaskTracker must have allowed |task| to be
+  // posted before this is called. This must only be called after |task|'s
+  // delayed run time.
+  virtual void PostTaskWithSequenceNow(
+      std::unique_ptr<Task> task,
+      scoped_refptr<Sequence> sequence,
+      SchedulerWorkerThread* worker_thread) = 0;
 };
 
 }  // namespace internal