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yucliu authored
Add function to serialize UnguessableToken to hex string, so that it can be saved as base::Value in PrefService. It will be used in MediaDrmStorageImpl. BUG=493521 TEST=UnguessableTokenTest Change-Id: I8185775e57dd4458f373ca89fd26a16c6daa346a Reviewed-on: https://chromium-review.googlesource.com/590571 Commit-Queue: Yuchen Liu <yucliu@chromium.org> Reviewed-by: Daniel Cheng <dcheng@chromium.org> Reviewed-by: Thomas Guilbert <tguilbert@chromium.org> Cr-Commit-Position: refs/heads/master@{#490875}
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