[OTPs] Add the dispatcher bridge for Android SMS OTP fetcher.

The communication between native and Java OTP filling code will
happen via 2 bridges.
1) One (dispatcher, implemented in this CL) will send requests to
the Java side
2) Another one (receiver, already landed) will propagate the replies
back.

There isn't a single bridge, because sending requests and receiving
replies from the downstream Java OTP fetcher has to happen on
different threads, so we need 2 different objects (since one object
should not live on 2 threads).
This is needed to avoid loading the main thread with posting an OTP
fetch request on the pageload (so it should happen on the background
thread to not hinder performance), but the replies will be posted on
the main UI thread by the downstream implementation.

Bug: 415271020
Change-Id: I4e1879502d486146219be5b7babecca7025d9597
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6553125
Reviewed-by: Ioana Pandele <ioanap@chromium.org>
Commit-Queue: Maria Kazinova <kazinova@google.com>
Cr-Commit-Position: refs/heads/main@{#1461331}
9 files changed
tree: aa7c8c1f47d2ff20009c91a3304fbc0171288cb0
  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. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. gpu/
  24. headless/
  25. infra/
  26. ios/
  27. ipc/
  28. media/
  29. mojo/
  30. native_client_sdk/
  31. net/
  32. pdf/
  33. ppapi/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .git-blame-ignore-revs
  53. .gitallowed
  54. .gitattributes
  55. .gitignore
  56. .gitmodules
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. CPPLINT.cfg
  68. CRYPTO_OWNERS
  69. DEPS
  70. DIR_METADATA
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. SECURITY_OWNERS
  79. WATCHLISTS
README.md

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