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... and the respective unittest, transceiver_state_surfacer_unittest.cc

This CL works out phase 7.4 on the design document [1].

[1] https://docs.google.com/document/d/1AJKVA5U4nDkyDB9p4ROrggWXadCxyy-grKaE9KS5vOU/

BUG=787254
R=guidou@chromium.org, haraken@chromium.org

Change-Id: I25384e38468cdfaf5e5fa2157f8f5993f1591f7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1820062
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705066}