Add stub lacros implementation for file_browser_handler API

This extension API was previously implemented in ash and this is part
of a series of CLs to add an implementation for lacros.

Set up manifest parsing, custom bindings etc. to work in lacros
as well as ash.

The actual implementation of the only function in the API,
fileBrowserHandler.selectFile, is left for later.

This allows us to install an extension in lacros that has
file_browser_handlers in the extension and load it without
any errors.

Cq-Include-Trybots: luci.chrome.try:linux-chromeos-chrome
Bug: 1240018
Change-Id: Id5c606329fa33e14adc0bbb60438c69e0528dd19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3267905
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/main@{#946278}
11 files changed
tree: 9007714a2fba06d8d28179744573b1de7c818ff3
  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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