Tommi 39d93da776 Add ScopedAllowBaseSyncPrimitives to WebRTC for compatibility with Chromium.
This will be overridden in Chromium in a future CL and following that,
used inside of WebRTC as needed while issues with blocking events are
being fixed.

Bug: chromium:796889, chromium:795340
Change-Id: I098a03d9bad621f1349ef483b82e4d8e786a8a75
Reviewed-on: https://webrtc-review.googlesource.com/40140
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Commit-Queue: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21659}
2018-01-17 14:36:36 +00:00
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