AI 144406: am: CL 144309 am: CL 144308 aapt extensions: required sdk version,...

AI 144406: am: CL 144309 am: CL 144308 aapt extensions: required sdk version, dependent software libraries, gadgets
  Add new attributes for sdk version, software libs and gadgets
  BUG = 1730924
  Original author: asuchitra
  Merged from: //branches/cupcake/...
  Original author: android-build

Automated import of CL 144406