Move FlatBuffer migration logic to TabPersistentStore

This patch moves the FlatBuffer migration logic from
TabStateFileManager to TabPersistentStore as it is believed the root
cause of the crashes is the TabState goes stale (i.e. WebContentsState
is freed) before the TabState is migrated to the FlatBuffer format.
By using an approach where the migration occurs in TabPersistentStore
it enables the TabState to be extracted immediately before the
migration occurs so it can't go stale. TabPersistentStore also offers
more natural integration points into events such as a Tab closing
(which results in the Tab being removed from the migration queue).

Bug: b:334854848, b:334620540
Change-Id: Ib997ffd6e64326cfecea33bda0963348bc4e3654
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5510042
Commit-Queue: David Maunder <davidjm@chromium.org>
Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1295928}
4 files changed
tree: 8f517a8920af96e0cc6cc5221a4e45572eeb81d0
  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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