[iOS Blink] Support a context menu for the content shell

This CL supports to show a context menu on the content shell.
The ContextMenuHiddenButton interface is moved from
WebContentViewIOS to ShellWebContentsViewDelegateIOS to
delegate building the context menu to
ShellWebContentsViewDelegateIOS as the Mac port.

ShellWebContentsViewDelegateIOS only supports basic menus as below,
  - Go to the Link
  - Copy Link
  - Cut
  - Copy
  - Paste
  - Delete

Bug: 333767962
Change-Id: I91db73eb3b10a9af0830a4528059bb26c5ad916c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5504214
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Ali Juma <ajuma@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/main@{#1295841}
4 files changed
tree: 5cfb19d9f23d8ce21f9ee06af89e1164ce77b52c
  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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