Implement experimental Cronet proxy API stubs

If Cronet is configured via setProxyOptions, Cronet will register a
new, Cronet-specific, ProxyDelegate. This will take care of:
1. Injecting into //net the List<Proxy> specified from the app
2. Calling back into the provided Proxy.Callback whenever it can
   add extra headers to the tunnel request and received a response
   for the tunnel request.

ProxyConfig is passed to the native side of the implementation by
leveraging the pre-existing RequestContextConfigOptions proto.

Callbacks are surfaced back to the java side of the implementation by
demultiplexing (via net::ProxyChain::opaque_data() added in the parent
CL) within a new per-CronetContext method.

Bug: b:422429341, b:421341930, b:422428959, b:422429606
Change-Id: I3c1a2c9665fbd8d9c86c54317aa39af32d1744a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6623834
Reviewed-by: Mohannad Farrag <aymanm@google.com>
Commit-Queue: Stefano Duo <stefanoduo@google.com>
Cr-Commit-Position: refs/heads/main@{#1475681}
29 files changed
tree: a8d8456a7562187964e4c6bff7dae05a35ab5899
  1. .github/
  2. android_webview/
  3. apps/
  4. ash/
  5. base/
  6. build/
  7. build_overrides/
  8. buildtools/
  9. cc/
  10. chrome/
  11. chromecast/
  12. chromeos/
  13. codelabs/
  14. components/
  15. content/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia_web/
  22. gin/
  23. google_apis/
  24. gpu/
  25. headless/
  26. infra/
  27. ios/
  28. ipc/
  29. media/
  30. mojo/
  31. native_client_sdk/
  32. net/
  33. pdf/
  34. ppapi/
  35. printing/
  36. remoting/
  37. rlz/
  38. sandbox/
  39. services/
  40. skia/
  41. sql/
  42. storage/
  43. styleguide/
  44. testing/
  45. third_party/
  46. tools/
  47. ui/
  48. url/
  49. webkit/
  50. .clang-format
  51. .clang-tidy
  52. .clangd
  53. .cursorignore
  54. .git-blame-ignore-revs
  55. .gitallowed
  56. .gitattributes
  57. .gitignore
  58. .gitmodules
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython3
  63. .yapfignore
  64. ATL_OWNERS
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. CPPLINT.cfg
  70. CRYPTO_OWNERS
  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. SECURITY_OWNERS
  81. WATCHLISTS
README.md

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