[StartupTabPreloader] Turn off in fieldtrial_testing_config.json

We are reviving the ClankStartupOptimizations experiment with the
experimental arms that (a) turn off both bootstrap task prioritization
and startup tab preloading and (b) turn off just startup tab preloading.
The former still causes a FullscreenManager test to fail locally, so
this CL turns on the latter in fieldtrial_testing_config.json. If we
resolve the test failure and increase the likelihood that we launch the
former, we can change fieldtrial_testing_config.json to list that
configuration instead.

Bug: 1258621
Change-Id: Ied5cec8bf34de78745f73ec6690e0bf91ef99193
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3417131
Reviewed-by: Egor Pasko <pasko@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#964580}
1 file changed
tree: 696a20fb2387217a69b1526b9b96b34e444234f9
  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. media/
  32. mojo/
  33. native_client_sdk/
  34. net/
  35. pdf/
  36. ppapi/
  37. printing/
  38. remoting/
  39. rlz/
  40. sandbox/
  41. services/
  42. skia/
  43. sql/
  44. storage/
  45. styleguide/
  46. testing/
  47. third_party/
  48. tools/
  49. ui/
  50. url/
  51. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython
  62. .vpython3
  63. .yapfignore
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. ENG_REVIEW_OWNERS
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
README.md

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