philipel d9cc8c08dc Encoder switching based on network and/or resolution conditions.
In this CL:
 - Renamed EncoderFailureCallback to EncoderSwitchRequestCallback. An encoder
   switch request can now also be made with a configuration that specifies which
   codec/implementation to switch to.
 - Added "WebRTC-NetworkCondition-EncoderSwitch" field trial that specifies
   switching conditions and desired codec to switch to.
 - Added checks to trigger the switch based on these conditions.

Bug: webrtc:10795
Change-Id: I9d3a9a39a7c4827915a40bdceed10b581d70b90a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/151900
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29196}
2019-09-16 13:43:29 +00:00
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