Add IdleProfileCloseTimeout policy

This policy lets admins configure a number of minutes. After this many
minutes of idle time, IdleService closes all browser windows and
displays the Profile Picker.

"Idle time" uses the definition from IdlePollingService in
//ui/base/idle, which calls OS-specific APIs. Things like moving the
mouse or typing on a keyboard reset the idle timer.

This is exploratory work, and may get deleted later; so the policy is
marked `future_on'. Also, some pretty important UX-y stuff is missing:

 - Showing some kind of dialog/warning before closing the windows.
 - Restoring the session on re-open. Right now the session would be
   lost, unless the "continue where I left off" option is chosen in
   chrome://settings or policies.

Bug: 1316551
Change-Id: Iacb677aaaff78e76cde18a4e326b3353a375a488
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3626393
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1022829}
18 files changed
tree: 89ba7539fbbf7102870d3d343b6edee1edc7aa2d
  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. weblayer/
  51. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython
  61. .vpython3
  62. .yapfignore
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  69. ENG_REVIEW_OWNERS
  70. LICENSE
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md
  77. WATCHLISTS
README.md

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