Merge commit 'f10748929f7edcf142357d03bed5464964284fdb' * commit 'f10748929f7edcf142357d03bed5464964284fdb': Adding wallpaper sample in ApiDemos.
Merge commit 'f10748929f7edcf142357d03bed5464964284fdb' * commit 'f10748929f7edcf142357d03bed5464964284fdb': Adding wallpaper sample in ApiDemos.