am cbbab0d5: am ffd5087e: Use the new sdk/build/tools.atree.

Merge commit 'cbbab0d57dfd297233b7fb52b30e0a95f3b0129e'

* commit 'cbbab0d57dfd297233b7fb52b30e0a95f3b0129e':
  Use the new sdk/build/tools.atree.