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A metric is added to count the number of times Flash permissions are
set for a website. The counter is separated based on whether this is the
first granting of permission or the next times.

Bug: 865933
Change-Id: If33aaf4915109f6e7ed49dc1e7142c64b6981fac
Reviewed-on: https://chromium-review.googlesource.com/1145197Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Markus Heintz <markusheintz@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579759}