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. 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. components/
  14. content/
  15. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. jingle/
  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. .vpython
  60. .vpython3
  61. .yapfignore
  62. AUTHORS
  63. BUILD.gn
  64. CODE_OF_CONDUCT.md
  65. codereview.settings
  66. DEPS
  67. ENG_REVIEW_OWNERS
  68. LICENSE
  69. LICENSE.chromium_os
  70. OWNERS
  71. PRESUBMIT.py
  72. PRESUBMIT_test.py
  73. PRESUBMIT_test_mocks.py
  74. README.md
  75. WATCHLISTS
README.md

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