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This CL adds a new crosapi method KeystoreService.GetKeyStores. This
provides the necessary and sufficient plumbing to implement
enterprise.platformKeysInternal.getTokens. The difference in
nomenclature and method signature between GetKeyStores and getTokens is
intentional -- the goal is to create a cleaner API surface for
stabilization.

As a necessary side effect, this CL adds
enterprise_platform_keys_internal.idl to Lacros builds.

Bug: 1127505
Change-Id: I1d6678708316d26edd2b4ca043662a0b34ab3c27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2406668Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Auto-Submit: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812920}