[carousel] Focus a column from ::column::scroll-marker.

Add support for focusing column content from a column scroll marker
(activate a scroll marker, then press tab). Since columns are in
fragment tree order, whereas focus switching operates on the DOM tree in
DOM order, some extra attention is required. Look for all Element
subtree roots inside the column, and then sort those in DOM order.

There's one thing missing, and that is culled inlines. If a column
starts with a focusable non-atomic inline (e.g. a plain A element),
we'll fail to find it in the fragment tree, since they get culled
instead of creating a proper fragment. Will fix that in a follow-up.

Bug: 378698659
Change-Id: Ice52d93946b06be2dc616328bac9838cb803e4a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6335848
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Daniil Sakhapov <sakhapov@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1431220}
8 files changed
tree: f0358a1c34803480d70b81d3f5071f75977747fc
  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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