wayland: add a chrome flag for fallback tab dragging impl

This makes easier for dogfood glinux users, for example, to try out that
experimental simplified tab dragging UI until major Wayland compositors
support xdg-toplevel-drag [1], for which a client impl for chromium is
under review already. In any case, a fallback is desirable, as it may
take time for the protocol extension to be widely available.

R=sky

Bug: 40238145
Change-Id: Id690f85110260a27bd60891ddea4c6cc7e86c93a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5641703
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Max Ihlenfeldt <max@igalia.com>
Cr-Commit-Position: refs/heads/main@{#1317308}
5 files changed
tree: 9dbf1a73276d5571f4f088acc053bfb04814a0ed
  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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