Use small BWE period when there is a true network degradation.

Bug: webrtc:8105
Change-Id: I751b89194f3fdb10ea41c6f9e48e38edefcbef1a
Reviewed-on: https://chromium-review.googlesource.com/616724
Commit-Queue: Minyue Li <minyue@webrtc.org>
Reviewed-by: Michael T <tschumim@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Cr-Original-Commit-Position: refs/heads/master@{#19469}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 82931001c2e79d2f9dd53fdc2d9ed2d22a977e9c
3 files changed