Actor: Add tests for general page stability monitor

This replaces two disabled flaky tests with a new test harness that more
directly exercises the monitor via the newly added mojo interface. I
wasn't able to repro the flakes and the analysis page no longer shows
any info but this CL tries a few things:

  * Avoid using an actor action (via PageStabilityMonitor mojo) to more
    directly ensure we've started the blocking task.
  * Avoid monitor timeouts.

Also a small fix in the monitor itself: if we're calling via the mojo
interface, the callback must be invoked synchronously. If we post it
then the receiver is torn down immediately after so the callback is
never received, only the disconnect handler.

Bug: b:427619749
Change-Id: I493d746038bf333be70476b41c81d40c06bb7722
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6991749
Commit-Queue: David Bokan <bokan@chromium.org>
Reviewed-by: Nan Lin <linnan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1522271}
3 files changed
tree: 1e5fce11bb77607d1f4fba2550989077dd1e62c5
  1. .gemini/
  2. .github/
  3. agents/
  4. android_webview/
  5. apps/
  6. ash/
  7. base/
  8. build/
  9. build_overrides/
  10. buildtools/
  11. cc/
  12. chrome/
  13. chromecast/
  14. chromeos/
  15. codelabs/
  16. components/
  17. content/
  18. crypto/
  19. dbus/
  20. device/
  21. docs/
  22. extensions/
  23. fuchsia_web/
  24. gin/
  25. google_apis/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. media/
  32. mojo/
  33. net/
  34. pdf/
  35. printing/
  36. remoting/
  37. rlz/
  38. sandbox/
  39. services/
  40. skia/
  41. sql/
  42. storage/
  43. styleguide/
  44. testing/
  45. third_party/
  46. tools/
  47. ui/
  48. url/
  49. webkit/
  50. .clang-format
  51. .clang-tidy
  52. .clangd
  53. .cursorignore
  54. .geminiignore
  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. CRYPTO_OWNERS
  72. DEPS
  73. DIR_METADATA
  74. LICENSE
  75. LICENSE.chromium_os
  76. OWNERS
  77. PRESUBMIT.py
  78. PRESUBMIT_test.py
  79. PRESUBMIT_test_mocks.py
  80. README.md
  81. SECURITY_OWNERS
  82. WATCHLISTS
README.md

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