am 52e4814f: Ensure that invalidate is called on main thread

* commit '52e4814f46230835ed48d7561de8359b79b978cd':
  Ensure that invalidate is called on main thread
tree: 9d02ef87cbace5485f2088898d2ff723e21c3fb9
  1. res/
  2. sample/
  3. src/
  4. tests/
  5. Android.mk
  6. AndroidManifest.xml
  7. project.properties