ozone/wayland: Decouple data drag code from WaylandDataDevice

Until now, both code that deals with the Wayland DND protocol and logic
for handling regular drag and drop operations has been living in the
same component, WaylandDataDevice (which also has code for handling
Clipboard operations).

As a means of supporting alternative DND use cases, mainly Window/Tab
dragging, this patch introduces DragDelegate interfaces into
DataDevice and DataSource classes, and shifts most of the use-case
specific responsibility to them.

WaylandDataDragController implements these brand new interfaces for the
usual "data" drag and drop operations, basically containing most of the
code previously in WaylandDataDevice. A second implementation for them
will be introduced in follow up CLs, aimed at supporting tab dragging.

Bug: 896640
Change-Id: I07ff12722230c1f5c065de857e77b086c75c18e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2205881
Reviewed-by: Maksim Sisov <msisov@igalia.com>
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#771044}
13 files changed
tree: ef0388d3bc45a9222c0696d74608f6c1cba494f5
  1. .clang-format
  2. .clang-tidy
  3. .eslintrc.js
  4. .git-blame-ignore-revs
  5. .gitattributes
  6. .gitignore
  7. .gn
  8. .vpython
  9. .vpython3
  10. .yapfignore
  11. AUTHORS
  12. BUILD.gn
  13. CODE_OF_CONDUCT.md
  14. DEPS
  15. ENG_REVIEW_OWNERS
  16. LICENSE
  17. LICENSE.chromium_os
  18. OWNERS
  19. PRESUBMIT.py
  20. PRESUBMIT_test.py
  21. PRESUBMIT_test_mocks.py
  22. README.md
  23. WATCHLISTS
  24. android_webview/
  25. apps/
  26. ash/
  27. base/
  28. build/
  29. build_overrides/
  30. buildtools/
  31. cc/
  32. chrome/
  33. chromecast/
  34. chromeos/
  35. cloud_print/
  36. codereview.settings
  37. components/
  38. content/
  39. courgette/
  40. crypto/
  41. dbus/
  42. device/
  43. docs/
  44. extensions/
  45. fuchsia/
  46. gin/
  47. google_apis/
  48. google_update/
  49. gpu/
  50. headless/
  51. infra/
  52. ios/
  53. ipc/
  54. jingle/
  55. media/
  56. mojo/
  57. native_client_sdk/
  58. net/
  59. pdf/
  60. ppapi/
  61. printing/
  62. remoting/
  63. rlz/
  64. sandbox/
  65. services/
  66. skia/
  67. sql/
  68. storage/
  69. styleguide/
  70. testing/
  71. third_party/
  72. tools/
  73. ui/
  74. url/
  75. weblayer/
README.md

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The project's web site is https://www.chromium.org.

Documentation in the source is rooted in docs/README.md.

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For historical reasons, there are some small top level directories. Now the guidance is that new top level directories are for product (e.g. Chrome, Android WebView, Ash). Even if these products have multiple executables, the code should be in subdirectories of the product.