ivoc 0d0b912128 Add and modify a few ANA stats.
This CL adds seperate counters for ANA frame length increases and decreases, which gives more insight into what actions are taken. In addition, a new stat is added to track the sum of the uplink packet loss fraction that is set by the ANA FEC controller.

BUG=webrtc:8127

Review-Url: https://codereview.webrtc.org/3007243002
Cr-Commit-Position: refs/heads/master@{#19756}
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