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This is the first change in a soft transition change in the
fuchsia.media.drm APIs. The LicenseSession OnKeysChanged event is being
renamed to OnKeyStatesChanged. This adds an identical handler to the
FuchsiaCdm::CdmSession. Implementations will send one or the other, but
not both events.

Bug: fxb/38522
Change-Id: I07b370f18f38b223c11a89bdc68fddc6955a2b21
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879521Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Commit-Queue: RJ Ascani <rjascani@google.com>
Cr-Commit-Position: refs/heads/master@{#709288}