[Impeller] Remove the DrawPaint->Clear optimization (#41711)

Fixes https://github.com/flutter/flutter/issues/125906.
Fixes https://github.com/flutter/flutter/issues/125908.

Going to add this back once I'm able to work out why the clear colors
aren't working on GL/Vulkan. Stepping though with a debugger for both
GLES and Vulkan, the clear colors seems to be getting piped through as
expected. But the frame captures reveal that they're actually not.
2 files changed
tree: 9a45350995e83fb4c6f32fcb0daec8757235f782
  1. .github/
  2. assets/
  3. benchmarking/
  4. build/
  5. ci/
  6. common/
  7. display_list/
  8. docs/
  9. examples/
  10. flow/
  11. flutter_frontend_server/
  12. flutter_vma/
  13. fml/
  14. impeller/
  15. lib/
  16. runtime/
  17. shell/
  18. sky/
  19. testing/
  20. third_party/
  21. tools/
  22. vulkan/
  23. wasm/
  24. web_sdk/
  25. .ci.yaml
  26. .clang-format
  27. .clang-tidy
  28. .gitattributes
  29. .gitignore
  30. .pylintrc
  31. .style.yapf
  32. analysis_options.yaml
  33. AUTHORS
  34. BUILD.gn
  35. CODEOWNERS
  36. CONTRIBUTING.md
  37. DEPS
  38. Doxyfile
  39. LICENSE
  40. README.md
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