[Reland] Generalize several places assuming header drags to support mixed drags.

The CL updating MoveSelectedTabsTo was getting unwieldy, so I split out
several standalone land-ahead-able parts of it into this CL:
- Generalize DraggingTabsSession::CalculateGroupForDraggedTabs to handle mixed drags. It now refuses to group tabs during mixed drags.
- Generalize TabDragController::GetViewsMatchingDraggedContents to handle mixed drags. This also required some smol plumbing changes in TabStrip/TabContainer.
- Removed TabDragController::first_tab_index(), as it is now a bit of a trap. Many users were assuming that everything starting at first_tab_index() onwards was a tab, which is not true for mixed drags. Fixed all the callers.
- Fixed tab group underline and highlight handling in TabStrip and TabDragContext to handle mixed drags correctly.

Bug: 406529289
Change-Id: I41971606b2b0e8c9426c181e7852079f609abf8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6477046
Reviewed-by: David Pennington <dpenning@chromium.org>
Commit-Queue: Shibalik Mohapatra <shibalik@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1450631}
3 files changed
tree: b5bb8c1a992f0e1754ac7f122a3f665e4741071b
  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
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