Update the timing to unblock post-login tasks.

Currently, post-login tasks are unblocked when all tasks considered
critical to login are completed, including animations.
However, due to race condition, the event may not reliably emitted.

This CL moves the timing a bit earlier, so while there're some
overlap of the timing to run the post-login tasks, and the animations,
it should run.

We also take the new metrics BootTime.Login4 for this purpose to see
the impact of animation waiting compared to BootTime.Login3.
Once we confirm that has negligible impact, we can simplify it
by replacing it to BootTime.Login4.

BUG=b/326065955, b/323098858
TEST=Run locally.

Change-Id: I6cfa234116d5b7ed9e3d71f3451ec7417f26a762
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5348944
Reviewed-by: Jun Ishiguro <junis@google.com>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1270646}
2 files changed
tree: fa96f6d8b89b42ac2f17a78857c6aea04f089238
  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. DEPS
  71. DIR_METADATA
  72. LICENSE
  73. LICENSE.chromium_os
  74. OWNERS
  75. PRESUBMIT.py
  76. PRESUBMIT_test.py
  77. PRESUBMIT_test_mocks.py
  78. README.md
  79. WATCHLISTS
README.md

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