Decouple FEC controller's decision from the decision making for frame length.

Bug: webrtc:8098
Change-Id: If313c8069a16bfb3c2752dcca7fb1cfca24c1caf
Reviewed-on: https://chromium-review.googlesource.com/643299
Reviewed-by: Michael T <tschumim@webrtc.org>
Reviewed-by: Ivo Creusen <ivoc@webrtc.org>
Commit-Queue: Minyue Li <minyue@webrtc.org>
Cr-Original-Commit-Position: refs/heads/master@{#19627}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 5fcd1cc4bbba639b1544c3ae9640ac45bfd1ff44
2 files changed