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This class is responsible for maintaining the integrity of a
UsageScenarioDataStore. The data providers will be added in separate
CLs.

When PowerMetricsReporter (to be added) receives power metrics from
PowerMonitor, it will query BatteryLevelProvider to obtain the battery
charge level, from which it will compute the discharge rate. Then, it
will query UsageScenarioDataStore via this class to obtain data about
the usage scenario.

Bug: 1153193
Change-Id: I6f97a9ce89c9b043a6b2df8adeebf95321b7b847
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2621678Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843727}