am 88510488: Update native_activity sample code to use ANativeWindow.

Merge commit '88510488e99d02e3b778ae530bb6e1e6aee3a226' into gingerbread-plus-aosp

* commit '88510488e99d02e3b778ae530bb6e1e6aee3a226':
  Update native_activity sample code to use ANativeWindow.