[iOS] Add Reading mode contextual panel entry point

This CL adds a Reading mode contextual panel model so that the Reading
mode contextual panel entry point can now appear on web pages. For now,
tapping the entry point shows the contextual panel.

Link to video:
https://drive.google.com/file/d/1nrb93PtCEIG8yGo3n8DnskUif0Xdoa0T/view

Bug: 416224001
Change-Id: Icb1c79659078ee20cab947127fc4ded554c3827a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6534924
Reviewed-by: Robbie Gibson <rkgibson@google.com>
Auto-Submit: Quentin Pubert <qpubert@google.com>
Commit-Queue: Quentin Pubert <qpubert@google.com>
Reviewed-by: Nohemi Fernandez <fernandex@google.com>
Cr-Commit-Position: refs/heads/main@{#1460151}
20 files changed
tree: 246bb8788c0ac81c99794c03fa370e0d1ce31765
  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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