Add ref_states to ProjectFields

This commit adds a new field called ref_states to the ProjectIndex. This
field can be used to perform staleness detection based on NoteDb ref
states. We store the HEAD SHA1s in 40 digit hex notation for the project
in question as well as all of it's ancestors.

Storing the ancestors ref states as well is necessary because the index
stores the names of all ancestors, so we need to detect when the
project's hirarchy changes and we get out of sync.

This approach follows what was done for changes, accounts and groups.

A subsequent commit will build a staleness checker and wire it up.

Change-Id: I08efd4286b4fd5c577c0863802bcdf051972f5cf
16 files changed
tree: 6cc1d7bae8875dc828557c27ac6775df3570564f
  1. .settings/
  2. antlr3/
  3. contrib/
  4. Documentation/
  5. gerrit-gwtdebug/
  6. gerrit-gwtui/
  7. gerrit-gwtui-common/
  8. gerrit-plugin-gwtui/
  9. java/
  10. javatests/
  11. lib/
  12. plugins/
  13. polygerrit-ui/
  14. prolog/
  15. prologtests/
  16. proto/
  17. resources/
  18. tools/
  19. webapp/
  20. .bazelproject
  21. .editorconfig
  22. .git-blame-ignore-revs
  23. .gitignore
  24. .gitmodules
  25. .mailmap
  26. .pydevproject
  27. 0001-Replace-native-http-git-_archive-with-Skylark-rules.patch
  28. 0002-Bump-Dagger-to-2.14.1-to-support-Java-9.patch
  29. BUILD
  30. COPYING
  31. INSTALL
  32. README.md
  33. SUBMITTING_PATCHES
  34. version.bzl
  35. WORKSPACE
README.md

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