MediaApp/A11y: Send a message to MediaApp when the OCR setting changes.

For PDF OCR to be enabled, a PDF must be opened in the app, the
screenreader must be enabled, and the PDF OCR must be enabled (though
its default setting is 'on'). Currently, the app directs users who try
to read the PDF contents to open it in the Chrome PDF Viewer, but since
we support it now, we should instead indicate to users how to enable
the feature if they're trying to read the PDF contents via a new aria
label.

To do so, we need to be able to detect when the OCR setting is currently
on or off. Observe the above conditions and send a message to the
MediaApp when any of them change in order to add the aria label
(advising users how to turn it on) when it's off.

Bug: b/324503524
Change-Id: I06db27a6fe8b08e08b4a956c1350b0e04ffeb2fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5568915
Reviewed-by: John Palmer <jopalmer@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Auto-Submit: Patti Lor <patricialor@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1310611}
8 files changed
tree: 486e996f7361aab02fca9ae7b77d483872e85209
  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. CPPLINT.cfg
  71. DEPS
  72. DIR_METADATA
  73. LICENSE
  74. LICENSE.chromium_os
  75. OWNERS
  76. PRESUBMIT.py
  77. PRESUBMIT_test.py
  78. PRESUBMIT_test_mocks.py
  79. README.md
  80. WATCHLISTS
README.md

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