Accessibility: fulfill increment/decrement AT actions.

Certain UI elements may expose actions to ATs to provide an adapted
interaction with that element. Among the default actions, there are
"increment" and "decrement" actions available for widgets that work
with incremental values. Examples in the web platform are aria-roles
slider or spinbutton, or <input type=range>.

The increment/decrement actions are implemented on blink and exposed by
the Mac accessibility backend, but they are not working because there is
a missing one piece in their implementation. We are adding that piece
here.

Bug: none
Change-Id: If8079edf599389475ce8931a2559da58cbcd7a46
AX-relnotes: implement increment/decrement actions on Mac.
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3158026
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Commit-Queue: Jacobo Aragunde Pérez <jaragunde@igalia.com>
Cr-Commit-Position: refs/heads/main@{#922480}
1 file changed
tree: 1b3cd4fa0471023ea046f1091649d20e5de47ac4
  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. cloud_print/
  13. codelabs/
  14. components/
  15. content/
  16. courgette/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. jingle/
  32. media/
  33. mojo/
  34. native_client_sdk/
  35. net/
  36. pdf/
  37. ppapi/
  38. printing/
  39. remoting/
  40. rlz/
  41. sandbox/
  42. services/
  43. skia/
  44. sql/
  45. storage/
  46. styleguide/
  47. testing/
  48. third_party/
  49. tools/
  50. ui/
  51. url/
  52. weblayer/
  53. .clang-format
  54. .clang-tidy
  55. .eslintrc.js
  56. .git-blame-ignore-revs
  57. .gitattributes
  58. .gitignore
  59. .gn
  60. .mailmap
  61. .vpython
  62. .vpython3
  63. .yapfignore
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. ENG_REVIEW_OWNERS
  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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