Implement CSS flow-relative Corner Rounding properties

Specifically, the following logical properties are included:
 - border-start-start-radius
 - border-start-end-radius
 - border-end-start-radius
 - border-end-end-radius

These properties correspond to the border-top-left-radius,
border-bottom-left-radius, border-top-right-radius,
and border-bottom-right-radius properties. The flow-relative
Corner Rounding properties (border-*-radius) will allow to
set top-left, bottom-left, top-right and bottom-right box
corners with logical mappings rather than physical.

Intent to Prototype and Ship: CSS flow-relative Corner Rounding
properties
https://groups.google.com/a/chromium.org/g/blink-dev/c/YmWSODSTPS4

Spec:
https://drafts.csswg.org/css-logical/#border-radius-properties

Test:
http://wpt.fyi/css/css-logical/logical-box-border-radius.html

Bug: 1155270
Change-Id: Ia4462092b08f2b2821218b1584fdb0985c98c5fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2570570
Reviewed-by: Manuel Rego <rego@igalia.com>
Reviewed-by: Oriol Brufau <obrufau@igalia.com>
Commit-Queue: Ziran Sun <zsun@igalia.com>
Cr-Commit-Position: refs/heads/master@{#836577}
24 files changed
tree: 59930230bdb1bac14a80c4065bcc67c1e1b817db
  1. .clang-format
  2. .clang-tidy
  3. .eslintrc.js
  4. .git-blame-ignore-revs
  5. .gitattributes
  6. .gitignore
  7. .gn
  8. .vpython
  9. .vpython3
  10. .yapfignore
  11. AUTHORS
  12. BUILD.gn
  13. CODE_OF_CONDUCT.md
  14. DEPS
  15. DIR_METADATA
  16. ENG_REVIEW_OWNERS
  17. LICENSE
  18. LICENSE.chromium_os
  19. OWNERS
  20. PRESUBMIT.py
  21. PRESUBMIT_test.py
  22. PRESUBMIT_test_mocks.py
  23. README.md
  24. WATCHLISTS
  25. android_webview/
  26. apps/
  27. ash/
  28. base/
  29. build/
  30. build_overrides/
  31. buildtools/
  32. cc/
  33. chrome/
  34. chromecast/
  35. chromeos/
  36. cloud_print/
  37. codelabs/
  38. codereview.settings
  39. components/
  40. content/
  41. courgette/
  42. crypto/
  43. dbus/
  44. device/
  45. docs/
  46. extensions/
  47. fuchsia/
  48. gin/
  49. google_apis/
  50. google_update/
  51. gpu/
  52. headless/
  53. infra/
  54. ios/
  55. ipc/
  56. jingle/
  57. media/
  58. mojo/
  59. native_client_sdk/
  60. net/
  61. pdf/
  62. ppapi/
  63. printing/
  64. remoting/
  65. rlz/
  66. sandbox/
  67. services/
  68. skia/
  69. sql/
  70. storage/
  71. styleguide/
  72. testing/
  73. third_party/
  74. tools/
  75. ui/
  76. url/
  77. weblayer/
README.md

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The project's web site is https://www.chromium.org.

Documentation in the source is rooted in docs/README.md.

Learn how to Get Around the Chromium Source Code Directory Structure .

For historical reasons, there are some small top level directories. Now the guidance is that new top level directories are for product (e.g. Chrome, Android WebView, Ash). Even if these products have multiple executables, the code should be in subdirectories of the product.