This CL adds a handful of histograms that track how many probes we send, and some details about
them.
We'll track the total number of requested probe clusters and how many of them timed out, recorded
when we destroy the prober. For the successful clusters we'll also track how many bytes it took,
how many packets we sent and how long it took to send.
Bug: webrtc:10413
Change-Id: I4a223caa6d3c2829a36788d4fa615a41286b183f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/127884
Reviewed-by: Åsa Persson <asapersson@webrtc.org>
Commit-Queue: Jonas Olsson <jonasolsson@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27270}
8f4338495d