Media App: Put PDF in readonly mode when `PdfAnnotationsEnabled` is off

This prevents users from being able to save{,as,copy}, add freehand or
text annotations while a PDF is loaded in the media app and PDF
annotations are disallowed by enterprise policy.

Requires passing down the WebUI to get Prefs similar to how Help App
does it
https://source.chromium.org/chromium/chromium/src/+/main:chrome/browser/ash/web_applications/help_app/help_app_untrusted_ui_config.cc;l=94?q=help%20app%20populateLoadTime&ss=chromium%2Fchromium%2Fsrc

Bug: b:207552979
Change-Id: I52b32e319b5a2f3616e6af470f8069626a26e58a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3365876
Reviewed-by: Zain Afzal <zafzal@google.com>
Commit-Queue: Joseph Kim <josephkimsh@google.com>
Cr-Commit-Position: refs/heads/main@{#955065}
4 files changed
tree: 437f051b67625ba08693a8c629fcf053dd96d922
  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. .rustfmt.toml
  62. .vpython
  63. .vpython3
  64. .yapfignore
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. DEPS
  70. DIR_METADATA
  71. ENG_REVIEW_OWNERS
  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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