am 31f8d506: AI 148879: Update SignatureTest with many fixes.   - Update SignatureTest to build against SDK   - Provides better error messages on failures   - Fixes issue with final methods in final classes (http://b/1839589)   - Fixes issue with strict checking on native modifier (http://b/1839558)   - Fixes issue with removal of abstract modifier on a class (http://b/1839622)   BUG=1839558,1839622,1839589

Merge commit '31f8d5069ecf4ecd3318eeb0875a42d2942548c2' into donut

* commit '31f8d5069ecf4ecd3318eeb0875a42d2942548c2':
  AI 148879: Update SignatureTest with many fixes.
tree: 9601644cdb36cf2232afcca8d5512c78503a7112
  1. tests/
  2. tools/
  3. Android.mk