Enable recording Winscope trace files

Currently flicker automatically parses the trace objects when recording traces with `withTracing`

Sometimes, however, it is necessary to collect the proto files instead of the flicker objects (e.g. for future debugging or data gathering).

This CL makes the recording methods available (previously internal) and introduces a new method to obtain the trace files

Bug: 167521849
Test: atest FlickerLibTest
Change-Id: Ie8b432f9fa76b77a7af90ff6aeb3bb9924410097
3 files changed
tree: d5287c17d0a11ea75909b4b2cd9fdecc6457d549
  1. build/
  2. docs/
  3. emu_test/
  4. libraries/
  5. scripts/
  6. tests/
  7. utils/
  8. PREUPLOAD.cfg