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When visibility metrics are written to histograms only the currently
tracked visibility bucket is logged. This can lead to some data loss.
This patch changes the behaviour of the record implemeantation to write
any outstanding data for all buckets. Also fixed a couple of spelling
errors in comments.

R=tobiasjs@chromium.org

Bug: 1139372
Change-Id: Idad1e18c9f581dab2579bce315b7b5f0750c736e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480565Reviewed-by: Tobias Sargeant <tobiasjs@chromium.org>
Commit-Queue: Idries Hamadi <idries@google.com>
Auto-Submit: Idries Hamadi <idries@google.com>
Cr-Commit-Position: refs/heads/master@{#819398}