Introduce pref for overscroll history navigation

Creates the pref `settings.a11y.overscroll_history_navigation` which
controls whether OverscrollController and GestureNavSimple are installed
on RenderWidgetHostViewAura and WebContentsViewAura respectively. This
pref will eventually replace the feature OverscrollHistoryNavigation,
but currently as there is no UI to disable the pref, when the feature is
turned off, overscroll will be disabled regardless of the pref state.

Bug: 1470913
Change-Id: I80312739e425bdd51ae92da6039c9e129f04d98b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4755263
Reviewed-by: Dana Fried <[email protected]>
Commit-Queue: Charles Meng <[email protected]>
Reviewed-by: Eshwar Stalin <[email protected]>
Reviewed-by: Avi Drissman <[email protected]>
Code-Coverage: [email protected] <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1183717}
19 files changed
tree: 81f5dd8c36df64c3705ea9b129ee0b38c1ce1e8c
  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. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  69. LICENSE
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md
  76. WATCHLISTS
README.md

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