Import path as p, in Workspace impl libraries

In package_build.dart, there are several spots (builtFile(),
builtPackageSourcePath(), ...) where `context` is called, in cases
where I imagine the author thought there was a class member at hand
(as is the case with PackageBuildPackageUriResolver), but these
locations are actually using the top-level const `context` from the
path package.

I think it is super confusing to have class members, and local
variables, that shadow an imported top-level const. Better to import
with a prefix.

Additionally, I unified relative/absolute checking in these files as
assert() calls, with helpful messages.

Change-Id: I6d409636dab41959cabf392c80f64c4ec5270f7b
Reviewed-on: https://dart-review.googlesource.com/c/82560
Commit-Queue: Samuel Rawlins <srawlins@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
6 files changed
tree: 41d2a77e3a1e4ab2d4215d6dd74dfaba1e1b641a
  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. .vpython
  22. AUTHORS
  23. BUILD.gn
  24. CHANGELOG.md
  25. codereview.settings
  26. CONTRIBUTING.md
  27. dartdoc_options.yaml
  28. DEPS
  29. LICENSE
  30. PATENTS
  31. PRESUBMIT.py
  32. README.dart-sdk
  33. README.md
  34. WATCHLISTS
README.md

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