Merge changes from topic 'dragon-drop' into nyc-dev

* changes:
  Clean up after a drop event.
  Enable dragon drop for touch.
tree: 08690466204ea0605adeda1a4e081ce1050f35b8
  1. res/
  2. src/
  3. tests/
  4. Android.mk
  5. AndroidManifest.xml
  6. lint.xml
  7. wrap_alpha.py