Make sure 'font-display: optional' doesn't cause relayout

This patch ensures that an 'optional' web font never causes relayout:

- When document rendering starts, any 'optional' web font that hasn't
  been loaded enters the failure period directly.

- When an @font-face rule is added, if document rendering has started
  and the font is not available from memory cache, then it enters the
  failure period directly.

In this way, any element attempting to use such 'optional' fonts will
always use a font that's further down in the 'font-family' list during
the document's lifetime.

Bug: 1040632
Change-Id: Idde675a8dddadf15d22c13b95db649410fd9cd0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2057502
Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749080}
8 files changed
tree: c638972dd448cc401aa936d05c65bbb00a7b6bbe
  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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