[Image Descriptions] Fix bug where enabled state is reflected in only one iframe

This CL makes an update to the image descriptions code for Android
accessibility.

With this CL we move the state out of the constructors of both the
browser accessibility manager and the WebContentsAccessibilityImpl. We
will now update the state as needed for each change in the device's
accessibility state. The source of truth for the C++ code will now be
web_contents_accessibility_android, so that all trees (iframes) will
reflect the same value.

AX-Relnotes: N/A
Bug: 1300364
Change-Id: I1f1ea12e170c97e40907c8443fe104d2006c92af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3923025
Commit-Queue: Mark Schillaci <mschillaci@google.com>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1054707}
8 files changed
tree: 8e6b87030840a8911a1b8181578c6064f0857da5
  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. weblayer/
  51. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. AUTHORS
  63. BUILD.gn
  64. CODE_OF_CONDUCT.md
  65. codereview.settings
  66. DEPS
  67. DIR_METADATA
  68. ENG_REVIEW_OWNERS
  69. LICENSE
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md
  76. WATCHLISTS
README.md

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