Fix CallStatsUnittests to update the RTT on the process thread (as in production).
Fix CallStatsUnittests to update the RTT on the process thread (as in production).

Bug: webrtc:10848
Change-Id: Ib56ba887ef148188c902dee680b29809ae8cb8f6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/148064
Reviewed-by: Magnus Flodman <3824e10219998be3d28f43c1b42bf2b769d2c38c@webrtc.org>
Commit-Queue: Tommi <74a97831ec830b6e3846c6faa50560947ae01c68@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#28768}

TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc