[Mac A11y] Set up unit tests for AXPlatformNodeCocoa

This cl sets up unit tests that should always pass (regardless of the
Cocoa AX API migration flag), as well as tests that require the Cocoa
API migration flag to be true or false. This cl also refines
introspection API related to the new Cocoa a11y API migration.

Test: out/default/accessibility_unittests \
  --gtest_filter="*AXPlatformNodeCocoaTest*"

out/default/content_browsertests \
  --disable-features=MacAccessibilityAPIMigration \
  --gtest_filter="*AriaCombobox/mac*:*Heading/mac*"

Bug: 363275809
Change-Id: Ie97ca57f8e43b4ec1c6f27566e7a5b515be5f112
AX-Relnotes: n/a
Include-Ci-Only-Tests: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5938610
Reviewed-by: Valerie Young <spectranaut@igalia.com>
Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Jayson Adams <shrike@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1375487}
5 files changed
tree: c72a2d5efe85ce30e7e94731b4fd63f7c49aac38
  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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