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The Encrypted Media Extensions spec requires that persistent CDM user
data is isolated per-origin. Previously, the Fuchsia CDM user data was
shared for each key system. This CL creates data stores for each origin
and provides them to the platform CDM service for storage of persistent
user data.

Bug: 991723
Change-Id: I45ff72410ae2f88311fcfe7f832707b72acdbb2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2138259
Commit-Queue: RJ Ascani <rjascani@google.com>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804254}