commit b5cba85c2f06240c7f3f76d44223d33dc4d62b5e
author Erik Språng <sprang@webrtc.org> Tue Feb 08 11:35:46 2022
committer WebRTC LUCI CQ <webrtc-scoped@luci-project-accounts.iam.gserviceaccount.com> Tue Feb 08 14:41:24 2022
tree 8ae06d15a3a39d5d5f39773d4b23a96905bd13f8
parent 27c1452fae386801eb8ad4c123a20e5d97591979

Add support for time-varying constraints in DegradedCall.

The fake network configs are now specified using just two field trials:
WebRTC-FakeNetworkSendConfig and WebRTC-FakeNetworkReceiveConfig.
Both of them have the following parameters from
BuiltInNetworkBehaviorConfig:

* queue_length_packets  // Queue length in number of packets.
* queue_delay_ms  // Delay in addition to capacity induced delay.
* delay_standard_deviation_ms   // Standard deviation of the extra delay.
* link_capacity_kbps  // Link capacity in kbps.
* loss_percent  // Random packet loss.
* allow_reordering  // If packets are allowed to be reordered.
* avg_burst_loss_length  // The average length of a burst of lost packets.
* packet_overhead  // Additional bytes to add to packet size.
* codel_active_queue_management  // Enable CoDel active queue management.

Plus:
* duration  // For how long to use this config before progressing.

Example:
WebRTC-FakeNetworkSendConfig/queue_delay_ms:66|1,loss_percent:1|0,link_capacity_kbps:200|10000,queue_length_packets:10|100,duration:15s|45s/
This creates two configs:
1. For 15s, apply 66ms delay, 1% loss, 200kbps bandwidth, 10 packet queue size
2. For 45s, apply 1ms delay, 0% loss, 10Mbps bandwidth, 100 packets queue size
(then repeat)

Bug: webrtc:13655
Change-Id: I0524f572de480731df4d414724203772182c628b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/251043
Reviewed-by: Stefan Holmer <holmer@google.com>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35952}