Add experimental web tests for BackgroundResourceFetch in Linux Tests

This CL adds two experimental ci_only test steps
(brfetch_blink_web_tests and brfetch_blink_wpt_tests) in Linux Tests
bots for the BackgroundResourceFetch feature (crbug.com/1379780).

BackgroundResourceFetch introduces a new resource loading logic in
Blink. This feature will impact almost all subresource loading, so we
need to run many tests to ensure that it works as expected. However,
running all tests with and without the feature for every commit in the
commit queue is not ideal.

These two test steps are 100% experimental, so the test failure doesn't
alert a sheriff. They are also ci_only, so they will only run on CQ when
`Include-Ci-Only-Tests: true` is set.

Bug: 1498364
Change-Id: Ieb08c90bf9568dd7b82a5fd58635ee1eeb493c3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4996932
Reviewed-by: Erik Staab <estaab@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1220076}
7 files changed
tree: 4cca7f65e0bfabea7f0eb6de55d318c226698f1f
  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. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gitmodules
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython3
  62. .yapfignore
  63. ATL_OWNERS
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  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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