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Currently most Profile.NumberOf[...] metrics only count 28DA profiles.
However, the Profile.NumberOfProfiles metric counts all profiles,
including inactive ones.

Add a Profile.NumberOfActiveProfiles metric to use as denominator for
NumberOf[...] metrics that count active profiles. Also update the
documentation on the NumberOf[...] metrics to describe whether they
count all or only active profiles.

BUG=832005

Change-Id: I85a23dfd792e8a39a88459b989e911126a9fca48
Reviewed-on: https://chromium-review.googlesource.com/1021813Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: anthonyvd <anthonyvd@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Florian Uunk <feuunk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553986}