Omit Attribution-Reporting-Support header when attribution support is
unset

This cl introduced a new `kUnset` enum for attribution support to
indicate that the attribution support is unknown which may happen for
fetches within service workers.

This cl has no behavioral change as attribution runtime features and
attribution support are always set together if ever, and therefore
Attribution-Reporting-Support header is not set when attribution
support is not set due to the runtime feature gating.

This is a preparation work to remove cross app web attribution runtime
feature in a follow up to retain the existing behavior.

Bug: 352077671
Change-Id: I91d5260db0af60ee4e3c9b27fdd93c7d16fed7bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5689294
Reviewed-by: Joe Mason <joenotcharles@google.com>
Commit-Queue: Nan Lin <linnan@chromium.org>
Reviewed-by: Andrew Paseltiner <apaseltiner@chromium.org>
Reviewed-by: Nate Chapin <japhet@chromium.org>
Reviewed-by: Anthony Garant <anthonygarant@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1325809}
13 files changed
tree: 17f87fd5a15c2314113300cd557f7e1927b7919f
  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. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia_web/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. media/
  31. mojo/
  32. native_client_sdk/
  33. net/
  34. pdf/
  35. ppapi/
  36. printing/
  37. remoting/
  38. rlz/
  39. sandbox/
  40. services/
  41. skia/
  42. sql/
  43. storage/
  44. styleguide/
  45. testing/
  46. third_party/
  47. tools/
  48. ui/
  49. url/
  50. webkit/
  51. .clang-format
  52. .clang-tidy
  53. .clangd
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitallowed
  57. .gitattributes
  58. .gitignore
  59. .gitmodules
  60. .gn
  61. .mailmap
  62. .rustfmt.toml
  63. .vpython3
  64. .yapfignore
  65. ATL_OWNERS
  66. AUTHORS
  67. BUILD.gn
  68. CODE_OF_CONDUCT.md
  69. codereview.settings
  70. CPPLINT.cfg
  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. WATCHLISTS
README.md

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