Merge commit '392481816eec1869345031d1600251dea8fba275' * commit '392481816eec1869345031d1600251dea8fba275': adding set wallpaper sample code in ApiDemos.
Merge commit '392481816eec1869345031d1600251dea8fba275' * commit '392481816eec1869345031d1600251dea8fba275': adding set wallpaper sample code in ApiDemos.