[e2e] Adjust audio timestamp handling

To increase consistency in the audio-related e2e tests, this CL
changes how the facade configures its virtual_audio output and input
devices -- specifically setting any simulated FIFO depth or external
delay to zero.

To enable more specific timestamp checking, it also adds completion
handlers for Start and Stop. The Start and PositionNotify completion
events are timestamped by the driver, so we should be able to use
these timestamps (on top of PositionNotify event 'time-of-arrival')
to discern between driver-related delays and delays in notification
delivery.

The CL also fixes up some log messages and comments.

Test: test-code only, change to logging behavior

Bug: 8587
Bug: 13693

Change-Id: I56811271427af55478f5626609c6028aaff751c2
1 file changed
tree: 1160b438f34032222a1b6b1311aa2b9325f0649e
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. garnet/
  7. peridot/
  8. products/
  9. scripts/
  10. sdk/
  11. src/
  12. third_party/
  13. tools/
  14. zircon/
  15. .clang-format
  16. .clang-tidy
  17. .dir-locals.el
  18. .gitattributes
  19. .gitignore
  20. .gn
  21. .style.yapf
  22. AUTHORS
  23. BUILD.gn
  24. CODE_OF_CONDUCT.md
  25. CONTRIBUTING.md
  26. LICENSE
  27. OWNERS
  28. PATENTS
  29. README.md
  30. rustfmt.toml
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