mac fullscreen: reparent web dialogs on entering and exiting fullscreen

Web dialogs will be occluded by the toolbar if they are created before
entering fullscreen. This is because the dialogs are children of the
browser window, which is behind the overlay widget.

This CL fixes the issue by:
* Add a kWidgetIdentifierKey native widget property to widgets.
* Mark constrained windows (e.g. web dialogs) using
kWidgetIdentifierKey.
* Reparent constrained windows to overlay window when entering
fullscreen.

kWidgetIdentifierKey would allow identifying a widget more easily. It
decouples the code that creates a widget from the code that wants to
identify a widget.

Bug: 1469898, 1476502
Change-Id: I379fa9da7d11c21dd8d1e00e9e808e9673ab9540
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4823250
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Commit-Queue: Keren Zhu <kerenzhu@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1190204}
5 files changed
tree: 70eafdbb57461eaf6bdaa305d2ecb7bee036aa3b
  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. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gitmodules
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython3
  63. .yapfignore
  64. ATL_OWNERS
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  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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