am b4fe143c: am b5ad157b: adding set wallpaper sample code in ApiDemos.

Merge commit 'b4fe143cfe18022653fc6710ba44a8f19c6b17ed' into eclair-mr2-plus-aosp

* commit 'b4fe143cfe18022653fc6710ba44a8f19c6b17ed':
  adding set wallpaper sample code in ApiDemos.