This is intended to make SequencedTaskChecker work for native dispatch queues
on iOS and macOS. These labels can be compared by their pointers to determine
if a task is running on the same queue.
BUG=webrtc:6643
Review-Url: https://codereview.webrtc.org/2464383002
Cr-Commit-Position: refs/heads/master@{#14900}
This it to avoid requiring targets that include header files that in turn use SequenceTaskedChecker, to also have to define the macros needed by TaskQueue.
BUG=webrtc:5687
Review-Url: https://codereview.webrtc.org/2145393003
Cr-Commit-Position: refs/heads/master@{#13482}
SequencedTaskChecker is a helper class used to help verify that some methods
of a class are called on the same task queue or thread. A
SequencedTaskChecker is bound to a a task queue if the object is
created on a task queue, or a thread otherwise.
BUG=webrtc:5687
Review-Url: https://codereview.webrtc.org/2125113003
Cr-Commit-Position: refs/heads/master@{#13452}
