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Create entropy_state_provider to record low_entropy_source and
old_low_entropy_source values to system profile for every metrics logs
as well as the local persistent file.

Bug: 1013707
Change-Id: Ie7fe38b023ada65e92e113aafaa49705b4931c48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1994098
Commit-Queue: Weilun Shi <sweilun@chromium.org>
Auto-Submit: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732637}