Use queue label as id in SequencedTaskChecker when not running on TaskQueue

webrtc/base/sequenced_task_checker_impl.h

Index: webrtc/base/sequenced_task_checker_impl.h
diff --git a/webrtc/base/sequenced_task_checker_impl.h b/webrtc/base/sequenced_task_checker_impl.h
index 96cb32de6d2740f66fd804d0111142094fb698af..dfb5e6d2dc2bce717a4ca854e13bc7f347a3ce47 100644
--- a/webrtc/base/sequenced_task_checker_impl.h
+++ b/webrtc/base/sequenced_task_checker_impl.h
@@ -23,6 +23,8 @@ class TaskQueue;
 // right version for your build configuration.
 class SequencedTaskCheckerImpl {
  public:
+  typedef const void* QueueId;

[tommi, 2016/11/02 16:32:50]

can we make this private?

[kthelgason, 2016/11/02 16:53:55]

Done.

+
   SequencedTaskCheckerImpl();
   ~SequencedTaskCheckerImpl();
 
@@ -37,7 +39,7 @@ class SequencedTaskCheckerImpl {
   CriticalSection lock_;
   ThreadChecker thread_checker_;
   mutable bool attached_;
-  mutable TaskQueue* valid_queue_;
+  mutable QueueId valid_queue_;
 };
 
 }  // namespace rtc