cros: cache process's priority sent to resourced

DBusSchedqosStateHandler caches the latest process priority in its
internal map because base::Process::GetPriority() is a synchronous API.

To prevent leak of cache, processes need to call
`base::Process::InitializePriority()` and
`base::Process::ForgetPriority()` explicitly. The browser process itself
and processes launched by `content::ChildProcessLauncher` support the
calls.

The examples of processes not launched by
`content::ChildProcessLauncher` are the second zygote process in sandbox
and broker processes launched by
`sandbox::policy::SandboxLinux::StartBrokerProcess()`. But they don't
update their scheduler settings anyway.

Bug: b:306246041
Change-Id: I2afe68fea1cbe981fced9520691a55a49d7e80a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5294979
Reviewed-by: Brian Geffon <[email protected]>
Commit-Queue: Shin Kawamura <[email protected]>
Reviewed-by: Gabriel Charette <[email protected]>
Reviewed-by: Avi Drissman <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1279444}
10 files changed
tree: 1fdacb28b69ee4caa3cde0005cfba73377c4bbd7
  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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