[Compare] Show comparison table submenu in tab context menu

This patch hooks up the "Add tab to comparison table" submenu to appear
in the tab context menu. The submenu is only shown if there are existing
sets that do not contain the tab's URL. Otherwise, only an "Add tab to
new comparison table" option is shown.

http://go/scrcast/NTI2NjE0NDE1NDg3Nzk1MnwzYTRhN2E0Yi1mOA

Bug: 390669584
Change-Id: Ibfa96f464f04476a09a0a7753b8ea6db09026d60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6219390
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Darryl James <dljames@chromium.org>
Commit-Queue: Chase Hartsell <chazzy@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1414390}
15 files changed
tree: 1262e5f5d7d1bb841e724c72d3cdcd93cd443f8c
  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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