[mixer_service] Copy ReusableBuffer to mixer_service

This is an exact copy of //src/media/audio/audio_core/reusable_buffer*
except for minor cleanup to update dependencies respectively.

It will be used in the `CustomStage` implementation.

Bug: 87651
Test: fx test -o audio_mixer_service_mix_unittests
Change-Id: I6db745cfc9ed7715e949c6a9ee6ad47bef386387
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/667003
Reviewed-by: Tom Bergan <tombergan@google.com>
Commit-Queue: Alper Gungormusler <alperg@google.com>
Fuchsia-Auto-Submit: Alper Gungormusler <alperg@google.com>
4 files changed
tree: 888db5d2be98774697e0d85236f7596cd9909147
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. garnet/
  7. products/
  8. scripts/
  9. sdk/
  10. src/
  11. third_party/
  12. tools/
  13. zircon/
  14. .clang-format
  15. .clang-tidy
  16. .editorconfig
  17. .git-blame-ignore-revs
  18. .gitattributes
  19. .gitignore
  20. .gn
  21. .style.yapf
  22. analysis_options.yaml
  23. AUTHORS
  24. BUILD.gn
  25. CODE_OF_CONDUCT.md
  26. CONTRIBUTING.md
  27. LICENSE
  28. OWNERS
  29. PATENTS
  30. pyrightconfig.json
  31. README.md
  32. rustfmt.toml
README.md

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