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AudioFader and AudioClockSimulator are used by multizone/sync.

Bug: b/152069660
Change-Id: I0bcf8068c1fa0dacae3330bcdde8aa8878aac253
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2138119
Commit-Queue: Qingwen Pi <qwp@google.com>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757153}