Introduce option to serialize less in frontend_server

This CL introduces an option - unsafe-package-serialization - where a
caller can select to reuse the serialization of packages. This makes it
unsafe in general, but if never invalidating packages, such as in tests,
it can be used to greatly increase the speed of processing many inputs.

This change - used in flutter - takes the time it takes to run
`flutter test` in `packages/flutter` from ~2 minutes 30 seconds to
~1 minute 15 seconds (on my machine).
A change to how flutter test executes the frontend_server
(to pass the option) is needed for it to take effect though.

Change-Id: Ibe47b43c41286eb08f80c9e7a398e1dc67bf9bc0
Reviewed-on: https://dart-review.googlesource.com/48200
Commit-Queue: Jens Johansen <jensj@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
1 file changed
tree: a4f5f8a2631385493d19a1dd4aec7ad796abf8fd
  1. .github/
  2. build/
  3. client/
  4. docs/
  5. pkg/
  6. runtime/
  7. samples/
  8. samples-dev/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitconfig
  17. .gitignore
  18. .gn
  19. .mailmap
  20. .packages
  21. AUTHORS
  22. BUILD.gn
  23. CHANGELOG.md
  24. codereview.settings
  25. CONTRIBUTING.md
  26. dartdoc_options.yaml
  27. DEPS
  28. LICENSE
  29. PATENTS
  30. PRESUBMIT.py
  31. README.dart-sdk
  32. README.md
  33. WATCHLISTS
README.md

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