Don't allow interactivity to escape inertness

Let inertness set by interactivity be forced for the subtree using the
same flag as for html inertness caused by modal dialogs and fullscreened
elements.

Also, let ::scroll-marker have a used inertness from its
::scroll-markers per resolution in [1].

The changed expectations in the inert reasons in the AX unit tests are
due to the fact that we now cannot see from the IsInert() flag whether
it was also set due to a modal dialog when the interactivity property
is set to 'inert' at the same time.

[1] https://github.com/w3c/csswg-drafts/issues/11746#issuecomment-2773041391

Bug: 370065759

Change-Id: I34b96698f1157b6fc49cce29daeb890114e58e69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6441921
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1446485}
12 files changed
tree: c5cffded62e7c478882dab3c21341ede6db20bbf
  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. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. gpu/
  24. headless/
  25. infra/
  26. ios/
  27. ipc/
  28. media/
  29. mojo/
  30. native_client_sdk/
  31. net/
  32. pdf/
  33. ppapi/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .git-blame-ignore-revs
  53. .gitallowed
  54. .gitattributes
  55. .gitignore
  56. .gitmodules
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. CPPLINT.cfg
  68. CRYPTO_OWNERS
  69. DEPS
  70. DIR_METADATA
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
README.md

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