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We have had some reports from users that claim the session performance
is pretty bad and they can improve it by hardcoding a higher min
bitrate.

To help us debug this issue, this CL adds support to the host to apply
min/max bitrate from session options.

Bug: 1096197
Change-Id: Ifd76fb81b9d69581740110a34f547e92efb63c33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2250662Reviewed-by: Lambros Lambrou <lambroslambrou@chromium.org>
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779605}