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These two functions are needed to notify the CDM about the last used
key IDs during suspend and resume.

Bug: 999747
Change-Id: I4f988784cc67d6e0699ec31ba2236de38c64615e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2331092
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796176}