[Mac A11y Sonoma] Reland Activate VoiceOver KVO monitoring later in start-up

The VoiceOver KVO monitoring setup code has a dependency on the
global accessibility state object. This cl ensures the KVO code runs
only after the global a11y object has been created.

This iteration of the cl includes the following changes:

* Ensures KVO notifications other than "voiceOverEnabled" are passed to
  the Application object's superclass (reason for revert).
* Ensures Chrome only acts on "voiceOverEnabled" KVO notifications where
  the global a11y object is the "context" (to avoid swallowing
  notifications destined for other observers).
* Adds a test to ensure the override of observeValueForKeyPath:... in
  BrowserCrApplication always calls super for notifications it
  doesn't match.

Bug: 330759711

Test: out/debug/browser_tests --gtest_filter=ChromeBrowserAppMac*
      out/default/browser_tests \
        --gtest_filter=*PromotionalTabsEnabledPolicy*

Include-Ci-Only-Tests: true
Change-Id: I0ee508a74ab40906fc22273de37f522294d3a1db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5436274
Commit-Queue: Jayson Adams <shrike@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1284798}
4 files changed
tree: 4c6e8297eb9e03738e64f74ebc590ebeaa3bbe03
  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. .clangd
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitallowed
  57. .gitattributes
  58. .gitignore
  59. .gitmodules
  60. .gn
  61. .mailmap
  62. .rustfmt.toml
  63. .vpython3
  64. .yapfignore
  65. ATL_OWNERS
  66. AUTHORS
  67. BUILD.gn
  68. CODE_OF_CONDUCT.md
  69. codereview.settings
  70. DEPS
  71. DIR_METADATA
  72. LICENSE
  73. LICENSE.chromium_os
  74. OWNERS
  75. PRESUBMIT.py
  76. PRESUBMIT_test.py
  77. PRESUBMIT_test_mocks.py
  78. README.md
  79. WATCHLISTS
README.md

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