[Merge M125] Add feature to ensure existing renderer is alive when used in RPH

When using an existing renderer, the OS process may have been killed by
the system (especially on Android). This feature makes sure the process
is started back up ASAP to decrease latency when using the renderer
process.

(cherry picked from commit cfcaadc23156c5f3df844cf417926fe83f711a74)

Bug: 332706093
Change-Id: I9c92b83ff8656e0d3803d9a97c37454df886d52d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5495030
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1293864}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5510298
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Auto-Submit: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/branch-heads/6422@{#617}
Cr-Branched-From: 9012208d0ce02e0cf0adb9b62558627c356f3278-refs/heads/main@{#1287751}
3 files changed
tree: 7cbc66b806324d0d760fb4c03edfc702c70f4218
  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. CPPLINT.cfg
  71. DEPS
  72. DIR_METADATA
  73. LICENSE
  74. LICENSE.chromium_os
  75. OWNERS
  76. PRESUBMIT.py
  77. PRESUBMIT_test.py
  78. PRESUBMIT_test_mocks.py
  79. README.md
  80. WATCHLISTS
README.md

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