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Based on some recent problems with the Client Side Phishing system, we
could use a few more high-level metrics. This CL adds three such
metrics:
- Whether the local model identifies phishing or not, on every
  classification
- Whether the server-side models identify phishing or not, every time
  we contact Safe Browsing. This can also be used to determine total
  pings sent to Safe Browsing.
- What the current model version is. While this is indirectly
  controlled by the Finch config, measuring it directly can detect
  mistakes made in the config or on the server-side.

Fixed: 1128205
Change-Id: Ia3e3036c7ce2dc9e3e6814bd626897ca0d055698
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416063Reviewed-by: Bettina Dea <bdea@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808575}