Fix headless_shell --single-process

- split HeadlessShell::Shutdown() into Shutdown() and ShutdownSoon() --
    close web contents immediately, but destroy the rest once we're
    out of the original task that requested it. This gives
    HeadlessWindowTreeHost time to get destroyed, as the latter invokes
    sync mojo calls from the destructor;
- invoke RenderProcessHost::ShutDownInProcessRenderer() during shutdown
    to tear down in-process RPH before the profiles get destroyed;
- allow base sync primitives in the former; it doesn't make sense to
    expose something in the content API if it requires other calls that
    are non-public.

Bug: 694424, 1086003
Change-Id: Ie63b4849c81dad8d2f7bf71e9d21fc7a4ce31be1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3312124
Reviewed-by: Francois Pierre Doray <fdoray@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Peter Kvitek <kvitekp@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/main@{#947656}
4 files changed
tree: 81c42045b2661f18b1b1136c1ad72d99b2b65cfc
  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. .rustfmt.toml
  62. .vpython
  63. .vpython3
  64. .yapfignore
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. DEPS
  70. DIR_METADATA
  71. ENG_REVIEW_OWNERS
  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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