kthelgason 44e0efe0e6 Use queue label as id in SequencedTaskChecker when not running on TaskQueue
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}
2016-11-02 17:28:23 +00:00
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