Fixed Full stack tests to correctly process selected TL and SL while calculating frame sizes. Added actual_bitrate metric which also accounts for TL and SL info. Metric encoded_frame_size calculation is cleaned up. Perf alerts should be ignored.
Fixed Full stack tests to correctly process selected TL and SL while
calculating frame sizes. Added actual_bitrate metric which also accounts
for TL and SL info. Metric encoded_frame_size calculation is cleaned up. Perf alerts should be ignored.

BUG=webrtc:7095

Review-Url: https://codereview.webrtc.org/2709483009
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#16800}

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