Add default lock wallpaper capability and API am: 5d99d47f39 am: e289467a1e
am: eca2131bb7
* commit 'eca2131bb7ce4ef652903ee39c98f7e82ea5a965':
Change-Id: Ic5360493283b88b259b42a29e1a7e71f1f0ce088
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