Window Placement: Allow requestFullscreen from onscreenschange

Similar to allowing requestFullscreen on screen orientation changes.
Allows sites to requestFullscreen when the user changes screen config
(e.g. when the user connects an external display to a laptop)

Add TransientAllowFullscreen for async support like UserActivationState.
(ScopedAllowFullscreen only supports sync, stack-allocation scopes)
Add a basic unit test for the new class, and an integration test.

Bug: 1077402
Test: window.onscreenschange = async () => { element.requestFullscreen({screen:(await getScreens())[1]}); };
Change-Id: Iffc5bb419e2b016704b923bd8454cb422672b5e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429967
Commit-Queue: Michael Wasserman <[email protected]>
Auto-Submit: Michael Wasserman <[email protected]>
Reviewed-by: Daniel Cheng <[email protected]>
Reviewed-by: Mustaq Ahmed <[email protected]>
Reviewed-by: John Abd-El-Malek <[email protected]>
Cr-Commit-Position: refs/heads/master@{#814036}
18 files changed
tree: ac92b160bb15a2b457e5088de9001883825aa455
  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. DIR_METADATA
  68. ENG_REVIEW_OWNERS
  69. LICENSE
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md
  76. WATCHLISTS
README.md

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