Yves Gerey cb11a310a6 Guard GenerateUniqueId() against concurrent access.
Both test and prod setups may use several signaling threads,
this CL prevents race conditions on GenerateUniqueId().

Bug: webrtc:9849
Change-Id: Iaec98b7b4f99729a9ad0642873a5d87de252cb1a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/147020
Commit-Queue: Yves Gerey <yvesg@google.com>
Commit-Queue: Seth Hampson <shampson@webrtc.org>
Reviewed-by: Seth Hampson <shampson@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28692}
2019-07-26 17:52:49 +00:00
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