Victor Boivie fd954fcec7 Import flat_map and flat_set from chromium/base/
These implementations have been copied from Chromium and adapted to
build and run in WebRTC's environment.

Bug: webrtc:12689
Change-Id: Id8ff5d86b00827102a6be9d613fad7864130d013
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/224661
Commit-Queue: Victor Boivie <boivie@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34425}
2021-07-06 19:57:18 +00:00
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