[ChromeOS tests] Make LoginManager tests wait for WebUI loaded.

This CL adds WizardControllerCreated event, ProfilePreparedWaiter
object, and makes LoginManagerMixin wait for WizardControllerCreated
and waif for profile prepared in LoginAsNewUser. It also allows
SessionStateWaiter to detect session change condition if it happened
before Wait was called.

Waiting for ProfilePrepared makes safe for most of the tests to
do user checks after login (and those that need immediate status
do not use this flow).

Waiting for WizardControllerCreated allows for it to be created
asynchronously (in the future change).

Bug: 1218161
Change-Id: Id4b05199a730d7925b1e8b65f26f96d542a0cd00
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3108506
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Auto-Submit: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#914728}
20 files changed
tree: b623ea350ad5a04335e8a464a43fd6268e288865
  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. jingle/
  32. media/
  33. mojo/
  34. native_client_sdk/
  35. net/
  36. pdf/
  37. ppapi/
  38. printing/
  39. remoting/
  40. rlz/
  41. sandbox/
  42. services/
  43. skia/
  44. sql/
  45. storage/
  46. styleguide/
  47. testing/
  48. third_party/
  49. tools/
  50. ui/
  51. url/
  52. weblayer/
  53. .clang-format
  54. .clang-tidy
  55. .eslintrc.js
  56. .git-blame-ignore-revs
  57. .gitattributes
  58. .gitignore
  59. .gn
  60. .mailmap
  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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