Convert the flickerlib assertion mechanism to kotlin lambdas

Also: make the FlickerLib tests compatible with this change.

Test: atest FlickerLibTest
Change-Id: I1d4c100fa916eeef4b9c43c062b774af193feec3
13 files changed
tree: 2b6f7791ed7c8c484972e0596a0834c37237049e
  1. build/
  2. docs/
  3. emu_test/
  4. libraries/
  5. scripts/
  6. tests/
  7. utils/
  8. PREUPLOAD.cfg