Legacy and FlatBuffer TabState parity on TabPersistentStore#saveState

It's an edge case but currently TabPersistentStore#saveState can end up
with Legacy/FlatBuffer TabState inconsistency. For example, if we
have a pending save for a Tab, TabPersistentStore#saveState will
save legacy TabState but not FlatBuffer TabState. It's possible an
earlier version of the TabState was stored to the FlatBuffer file. So
when the user restarts they will get a previous snapshot of their Tab.
This change ensures we save FlatBuffer TabState if
1) saveState() saves a pending Tab Save
2) If there's a pending migration in the queue for which a FlatBuffer
file already exists (to ensure we're not in a state on startup where
a previous snapshot would be restored).

Bug: b:344029269
Change-Id: Iaeeb7589098779941db54c8814fd0fd729859d1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5591710
Commit-Queue: David Maunder <davidjm@chromium.org>
Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1309720}
3 files changed
tree: afb2b1dfac36967401c8ee9b4f731b2c364677eb
  1. android_webview/
  2. apps/
  3. ash/
  4. base/
  5. build/
  6. build_overrides/
  7. buildtools/
  8. cc/
  9. chrome/
  10. chromecast/
  11. chromeos/
  12. codelabs/
  13. components/
  14. content/
  15. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia_web/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. media/
  31. mojo/
  32. native_client_sdk/
  33. net/
  34. pdf/
  35. ppapi/
  36. printing/
  37. remoting/
  38. rlz/
  39. sandbox/
  40. services/
  41. skia/
  42. sql/
  43. storage/
  44. styleguide/
  45. testing/
  46. third_party/
  47. tools/
  48. ui/
  49. url/
  50. webkit/
  51. .clang-format
  52. .clang-tidy
  53. .clangd
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitallowed
  57. .gitattributes
  58. .gitignore
  59. .gitmodules
  60. .gn
  61. .mailmap
  62. .rustfmt.toml
  63. .vpython3
  64. .yapfignore
  65. ATL_OWNERS
  66. AUTHORS
  67. BUILD.gn
  68. CODE_OF_CONDUCT.md
  69. codereview.settings
  70. CPPLINT.cfg
  71. DEPS
  72. DIR_METADATA
  73. LICENSE
  74. LICENSE.chromium_os
  75. OWNERS
  76. PRESUBMIT.py
  77. PRESUBMIT_test.py
  78. PRESUBMIT_test_mocks.py
  79. README.md
  80. WATCHLISTS
README.md

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