[A11y] Alert events must only be fired on alert roles

In patchset 1, we move the failing check from Linux-specific code to
all of the places it needs to be checked in cross-platform code.
Previously, the alert only failed in some situations on Linux.
This is stricter and catches the error more often.

The last patchset contains all of the necessary fixes. This CL is
necessary to green the a11y CI bot.

As part of this change, I'm simplifying the call sites that had
a hack for MacOS to use alerts where every other OS uses AnnounceText().
I tracked down when we started doing that and spoke with the engineer,
and tested the case in question. It seems that AnnounceText() is working
fine on Mac as long as VoiceOver is running.

Fixed: 1493738,1377831,1369912
Change-Id: I82449659bd6ca10fd66acc6ae4f8681716aaf7f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4980070
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Reviewed-by: David Tseng <dtseng@chromium.org>
Auto-Submit: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1224618}
15 files changed
tree: 2ff068b81022f5e846407efdc7c1fcb590c682ac
  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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