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Encryption is done at the command level. Specifically, when encrypted
each command is written as a length (not encrypted) followed by the
encrypted command-id and command-contents pair.

BUG=1033924
TEST=component_unittests CommandStorageBackend*

Change-Id: I4899b6daefba85ef3ae865262b375ad345341c63
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2017981Reviewed-by: Adam Langley <agl@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735963}