Add contextlost/restored to GlobalEventHandlers and OffscreenCanvas

`contextlost` and `contextrestored` IDL attributes
are supported by GlobalEventHandlers[0] and OffscreenCanvas[1]

This new spec addition is not implemented
yet in Safari[2] and Firefox[3] but they are positive for it.


[0] https://html.spec.whatwg.org/multipage/indices.html#event-contextlost
[1] https://html.spec.whatwg.org/multipage/canvas.html#offscreencanvas
[2] https://github.com/whatwg/html/issues/4809#issuecomment-641546468
[3] https://github.com/whatwg/html/issues/4809#issuecomment-640961008


R=fwang@igalia.com, yiyix@chromium.org

Bug: 1267688
Change-Id: Ie18ffb93dee884d2daa195187196c3c41a512378
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3268684
Commit-Queue: Yi Xu <yiyix@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Yi Xu <yiyix@chromium.org>
Reviewed-by: Mason Freed <masonf@chromium.org>
Cr-Commit-Position: refs/heads/main@{#944599}
20 files changed
tree: 2f22b2112ac7a885d03c0a6887e059a14cef355c
  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. codelabs/
  14. components/
  15. content/
  16. courgette/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. jingle/
  32. media/
  33. mojo/
  34. native_client_sdk/
  35. net/
  36. pdf/
  37. ppapi/
  38. printing/
  39. remoting/
  40. rlz/
  41. sandbox/
  42. services/
  43. skia/
  44. sql/
  45. storage/
  46. styleguide/
  47. testing/
  48. third_party/
  49. tools/
  50. ui/
  51. url/
  52. weblayer/
  53. .clang-format
  54. .clang-tidy
  55. .eslintrc.js
  56. .git-blame-ignore-revs
  57. .gitattributes
  58. .gitignore
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython
  63. .vpython3
  64. .yapfignore
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. DEPS
  70. DIR_METADATA
  71. ENG_REVIEW_OWNERS
  72. LICENSE
  73. LICENSE.chromium_os
  74. OWNERS
  75. PRESUBMIT.py
  76. PRESUBMIT_test.py
  77. PRESUBMIT_test_mocks.py
  78. README.md
  79. WATCHLISTS
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