GitLab

This CL changes how platform keys service expects token IDs from the
service consumers and makes it clear what to expect in special cases
like empty/unprovided token IDs.

Before this CL, platform keys service was accepting token IDs as strings
which is not as clear as enums especially for the cases of empty
strings.

Bug: 1073512
Change-Id: I4cbdfdc8f22b23ce0297314915e52804b2e495f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2270069
Commit-Queue: Omar Morsi <omorsi@google.com>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Michael Ershov <miersh@google.com>
Cr-Commit-Position: refs/heads/master@{#784448}