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This is the first step needed to enable defining a similar class that
will detect different chromium usage scenarios to be recorded alongside
power use.

Bug: 1153193
Change-Id: I29e59a8cffae7cc5962882f78c8fbbf29073a170
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2597013
Commit-Queue: Oliver Li <olivierli@chromium.org>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844802}