wayland: xdg-session-management: Add required UI/Views toolkit bits

Some platforms support session management assisted by the display
server. Such as, Linux/Wayland with the xdg-session-management protocol
extension. In this CL, the following components are added to a few
different layers of the UI/Views framework:

1. ui/ozone:
  - ui::PlatformSessionManager and ui::PlatformSessionWindowData: A new
    ozone/public interface as well its accessor method in OzonePlatform,
    with which client code (eg: chrome) can create and restore platform
    sessions in a platform-neutral way.
2. ui/platform_window and ui/views:
  - Add the widget and platform window init parameters/properties
    required to plumb session info through from, e.g chrome, all the way
    down to native widget => platform window implementation (ie:
    ozone/wayland).

Further design notes available at
https://notes.nickdiego.dev/chromium/wayland-session-management

The upcoming CLs will add the remaining bits, including:

- Ozone/Wayland implementation based on xdg-toplevel-drag-v1 protocol.
- Chrome required plumbing and required changes.

R=fangzhoug

Bug: 352081012
Change-Id: Ie4dbcc559303c77d72b030b04c95ec933887855a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6329156
Reviewed-by: Avi Drissman <avi@chromium.org>
Auto-Submit: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Kramer Ge <fangzhoug@chromium.org>
Reviewed-by: Tom Lukaszewicz <tluk@chromium.org>
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Cr-Commit-Position: refs/heads/main@{#1438502}
7 files changed
tree: d81d583c55357ba6e8a506a91ec3d141ea9ae663
  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
README.md

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