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This CL adds 2 new histogram. One for cert policy cache stored for Tab
and one for all Tabs.

Bug: 1140990
Change-Id: I03de0330759915974b4c89ceb7ee929d0118a53e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519153
Commit-Queue: Eugene But <eugenebut@chromium.org>
Auto-Submit: Eugene But <eugenebut@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824610}