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This CL adds latest graph values to the legend to make current
system state easier to read.

Screenshots:
https://screenshot.googleplex.com/7GEoQ34yCo4LGuX.png
https://screenshot.googleplex.com/A2jgLi6Nt8x6erc.png

Bug: 1132183
Change-Id: I4d0ac763487fe3259da22cbe84e624ddd2ef9688
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2430090Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811575}