Add nsAccessibility mappings for the ARIA feed role

When support for the ARIA feed role was added, no mappings were done
for the Mac. As a result, elements with the feed role wind up having
the "unknown" role and getting pruned for the accessibility tree.

According to the Core-AAM, the mapping is:

  AXRole: AXGroup
  AXSubrole: AXApplicationGroup

AXRelnotes: Add mappings for the ARIA feed role so that it is not
pruned from the accessibility tree.

Bug: 1240135
Change-Id: I6561123e626abb331bf28b283d66754a0a5e4e8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3097825
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Commit-Queue: Joanmarie Diggs <jdiggs@igalia.com>
Cr-Commit-Position: refs/heads/master@{#912204}
3 files changed
tree: 0bc2e5c1e9b680ff02c54a2444c44c0fdefe10dd
  1. .clang-format
  2. .clang-tidy
  3. .eslintrc.js
  4. .git-blame-ignore-revs
  5. .gitattributes
  6. .gitignore
  7. .gn
  8. .mailmap
  9. .vpython
  10. .vpython3
  11. .yapfignore
  12. AUTHORS
  13. BUILD.gn
  14. CODE_OF_CONDUCT.md
  15. DEPS
  16. DIR_METADATA
  17. ENG_REVIEW_OWNERS
  18. LICENSE
  19. LICENSE.chromium_os
  20. OWNERS
  21. PRESUBMIT.py
  22. PRESUBMIT_test.py
  23. PRESUBMIT_test_mocks.py
  24. README.md
  25. WATCHLISTS
  26. android_webview/
  27. apps/
  28. ash/
  29. base/
  30. build/
  31. build_overrides/
  32. buildtools/
  33. cc/
  34. chrome/
  35. chromecast/
  36. chromeos/
  37. cloud_print/
  38. codelabs/
  39. codereview.settings
  40. components/
  41. content/
  42. courgette/
  43. crypto/
  44. dbus/
  45. device/
  46. docs/
  47. extensions/
  48. fuchsia/
  49. gin/
  50. google_apis/
  51. google_update/
  52. gpu/
  53. headless/
  54. infra/
  55. ios/
  56. ipc/
  57. jingle/
  58. media/
  59. mojo/
  60. native_client_sdk/
  61. net/
  62. pdf/
  63. ppapi/
  64. printing/
  65. remoting/
  66. rlz/
  67. sandbox/
  68. services/
  69. skia/
  70. sql/
  71. storage/
  72. styleguide/
  73. testing/
  74. third_party/
  75. tools/
  76. ui/
  77. url/
  78. weblayer/
README.md

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