Inject a private language tag in the browser when in demo mode

Add a private language tag used to identify the country that the device
is set up for if it is running in demo mode. The tag is injected so that
it is only available in the navigator.languages property from JS. The
tag is only injected if the device is actually running in demo mode.

This tag can be used by the demo mode Web applications running on the
device to determine the country the device was set up for, and offer
ways to switch the language of the app (not the OS) for customers in that country. For example, in Canada, English and French could be offered,
while in the USA, English and Spanish could, etc.

Bug: b:179831342
Test: Build, start demo mode (or not) and check navigator.languages
Change-Id: Ia362719b920cbb40309c8017135f1cef4ab393e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2709933
Reviewed-by: Scott Violet <[email protected]>
Auto-Submit: Yves Arrouye <[email protected]>
Commit-Queue: Yves Arrouye <[email protected]>
Cr-Commit-Position: refs/heads/master@{#856533}
3 files changed
tree: efb6234bc5ed12d71289acd45934cddf64e77bb3
  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. .vpython
  61. .vpython3
  62. .yapfignore
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  69. ENG_REVIEW_OWNERS
  70. LICENSE
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md
  77. WATCHLISTS
README.md

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