Apply os setting of overlay scrollbar to web instances

This is the last CL to use ChromeOS OverlayScrollbar system pref to
determine whether to always show scrollbars. With this CL, relaunch
is not needed to apply the overlay scrollbar os settings change.

Control logic : overlay scrollbar will be turned off only when
overlayscrollbar feature flag off and always show scrollbar os settings
on.

Demos 1: overlay scrollbar feature flag is off, os setting is on.
scrollbar is controlled by alawys show scrollbar os setting.
https://drive.google.com/file/d/1TDTW3jrnRb1WiB20UJU1e9U0YXzA8ZL1/view?usp=sharing&resourcekey=0-_JTjOZWyEFX4nGs0gxkgdQ
Demo 2: overlay scrollbar feature flag is on, os setting is on.
scrollbar will always be on no matter always show scrollbar os setting.
https://drive.google.com/file/d/1tpJAH-qksMIoagXg4SDHs69UBr85KM3Q/view?usp=sharing&resourcekey=0-ZNU4HggvoQ8WoeBEJQVvDg
Demo 3: os setting is off.
Always show scrollbar os setting will be invisible.
scrollbar will be controlled by overlay scrollbar feature flag.
https://drive.google.com/file/d/1DeK00Sv3IdY2Rj4OGhKAtd2J0saABpKg/view?usp=sharing&resourcekey=0-oaOukitbXoF_aV8iSIl_sQ
https://drive.google.com/file/d/1iiE126hT4fXuhNvIKjvy37xyhYf61-Bx/view?usp=sharing&resourcekey=0-KHvG7I_iaNvro-xvEwyh3w

Bug: b:367789464
Change-Id: I8b8a4a2f263ca6b465f0cc8de56c2b0ccccd07ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5977022
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Zhengzheng Liu <zhzhliu@chromium.org>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1380652}
21 files changed
tree: 04bd8c983be7e78d89f9694bf34f4b4e9133c08b
  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. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. gpu/
  24. headless/
  25. infra/
  26. ios/
  27. ipc/
  28. media/
  29. mojo/
  30. native_client_sdk/
  31. net/
  32. pdf/
  33. ppapi/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .git-blame-ignore-revs
  53. .gitallowed
  54. .gitattributes
  55. .gitignore
  56. .gitmodules
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. CPPLINT.cfg
  68. CRYPTO_OWNERS
  69. DEPS
  70. DIR_METADATA
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
README.md

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