Add TaskRunner wrapper for WorkerPool.

base/threading/worker_pool.h

Index: base/threading/worker_pool.h
diff --git a/base/threading/worker_pool.h b/base/threading/worker_pool.h
index 6694830e7d7a560612bf48b5b6ed279737fa3964..93beeebd637d7f29331f8a3b286a2b185f98dcc7 100644
--- a/base/threading/worker_pool.h
+++ b/base/threading/worker_pool.h
@@ -8,6 +8,7 @@
 
 #include "base/base_export.h"
 #include "base/callback_forward.h"
+#include "base/memory/ref_counted.h"
 
 class Task;
 
@@ -17,6 +18,8 @@ class Location;
 
 namespace base {
 
+class TaskRunner;
+
 // This is a facility that runs tasks that don't require a specific thread or
 // a message loop.
 //
@@ -41,6 +44,16 @@ class BASE_EXPORT WorkerPool {
                                const Closure& task,
                                const Closure& reply,
                                bool task_is_slow);
+
+  // Return true if the current thread is one that this WorkerPool runs tasks
+  // on.  (Note that if the Windows worker pool is used without going through
+  // this WorkerPool interface, RunsTasksOnCurrentThread would return false on
+  // those threads.)
+  static bool RunsTasksOnCurrentThread();
+
+  // Get a TaskRunner wrapper which posts to the WorkerPool using the given
+  // |task_is_slow| behavior.
+  static const scoped_refptr<TaskRunner>& GetTaskRunner(bool task_is_slow);
 };
 
 }  // namespace base