fws: Disable floating workspace when there is crash loop. Make fws policy check null safe.

1. When chrome crashes within 30 secs for more than 3 times, OS daemon
   will set safe-mode flag. Under such case, disable fws capturing and
   restoring.
2. When fws is disabled due to safe mode, send corresponding
   notification.
3. Update the fws policy check to be null safe - when no active user,
   fws check should return false instead causing crash.

Test: Manual tested.
Bug: b:309530704
Change-Id: Ide3ffda974322b71d1e6f646e9af6dd469049ee6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5018465
Reviewed-by: Yanzhu Du <yzd@google.com>
Reviewed-by: Nicolas Dossou-Gbété <dgn@chromium.org>
Commit-Queue: April Zhou <aprilzhou@google.com>
Cr-Commit-Position: refs/heads/main@{#1224483}
6 files changed
tree: 4d66e1fcef529e362c5ecab0dadb319bdec38611
  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. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gitmodules
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython3
  62. .yapfignore
  63. ATL_OWNERS
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. LICENSE
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md
  77. WATCHLISTS
README.md

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