Start gathering perf data for VP8 + FlexFEC.
Start gathering perf data for VP8 + FlexFEC.

This is to assess the performance penalty of the (current)
lack of integration with FlexFEC and BWE.

This CL also enables send-side BWE for the following tests:
- foreman_cif_net_delay_0_0_plr_0_VP9
- foreman_cif_net_delay_0_0_plr_0_H264
- foreman_cif_delay_50_0_plr_5_VP9
- foreman_cif_delay_50_0_plr_5_H264
- foreman_cif_delay_50_0_plr_5_H264_flexfec
- foreman_cif_delay_50_0_plr_5_H264_ulpfec
Perf alerts on these tests are therefore expected.

R=stefan@webrtc.org
BUG=webrtc:5654

Review-Url: https://codereview.webrtc.org/2534203004
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#15339}

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