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This should be landed after http://crrev.com/c/2016802 which adds the concierge Suspend/Resume D-Bus methods.

Bug: b:140083246
Test: Suspend/resume DUT, previously playing YouTube video is paused on resume

Change-Id: I075e9e8c72698118f28aa9b798a733a89eb1ea4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2016766Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Alex Lau <alexlau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742964}