ozone/wayland: support new tab dragging fallback

This is CL 2/3 for implementing a new tab dragging fallback for
platforms that do not support RunMoveLoop() (currently only Wayland).

This CL adds overrides for the new IsMoveLoopSupported() API (introduced
in the last CL) for Wayland. When running without the extended drag
protocol extension, these overrides signal that the platform does not
support RunMoveLoop().

Furthermore, changes are made to the platform Drag and Drop handling
that will be needed for the changes to the upper layers in the next CL.

All changes are behind a feature flag until tests for the new tab
dragging fallback have been implemented.

Bug: 896640
Change-Id: I40c61210acf4ab8741ce2830af6cef379bf0e662
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3327028
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Nick Yamane <nickdiego@igalia.com>
Commit-Queue: Max Ihlenfeldt <mihlenfeldt@igalia.com>
Cr-Commit-Position: refs/heads/main@{#963291}
17 files changed
tree: 4ec9992980cdfed0b32ad30aee47153d9470cbbd
  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. cloud_print/
  13. codelabs/
  14. components/
  15. content/
  16. courgette/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. media/
  32. mojo/
  33. native_client_sdk/
  34. net/
  35. pdf/
  36. ppapi/
  37. printing/
  38. remoting/
  39. rlz/
  40. sandbox/
  41. services/
  42. skia/
  43. sql/
  44. storage/
  45. styleguide/
  46. testing/
  47. third_party/
  48. tools/
  49. ui/
  50. url/
  51. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython
  62. .vpython3
  63. .yapfignore
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. ENG_REVIEW_OWNERS
  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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