Reverts "[Impeller] one descriptor pool per frame. (#55939)" (#55959)

Reverts: flutter/engine#55939
Initiated by: jonahwilliams
Reason for reverting: failing on scenario test
Original PR Author: jonahwilliams

Reviewed By: {matanlurey}

This change reverts the following previous change:
Creating descriptor pools is expensive, no need to have more than one per frame.

The lifecycle of the descriptor pool is exactly the same as the cmd pool, which indicates that we can probably do some consolidation/refactoring in the future.

Fixes https://github.com/flutter/flutter/issues/157115
10 files changed
tree: 04dcf019558255d409fb78bcefc56d07eb54a7b7
  1. .github/
  2. assets/
  3. benchmarking/
  4. bin/
  5. build/
  6. build_overrides/
  7. ci/
  8. common/
  9. display_list/
  10. docs/
  11. examples/
  12. flow/
  13. flutter_frontend_server/
  14. flutter_vma/
  15. fml/
  16. impeller/
  17. lib/
  18. runtime/
  19. shell/
  20. skia/
  21. sky/
  22. testing/
  23. third_party/
  24. tools/
  25. vulkan/
  26. wasm/
  27. web_sdk/
  28. .ci.yaml
  29. .clang-format
  30. .clang-tidy
  31. .engine-release.version
  32. .git-blame-ignore-revs
  33. .gitattributes
  34. .gitignore
  35. .pylintrc
  36. .style.yapf
  37. analysis_options.yaml
  38. AUTHORS
  39. BUILD.gn
  40. CODEOWNERS
  41. CONTRIBUTING.md
  42. DEPS
  43. Doxyfile
  44. engine.code-workspace
  45. LICENSE
  46. pubspec.yaml
  47. README.md
README.md

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