Cap the path builder iteration limit to 20

UMA reports that all validations below a rounding error (the
tool shows 100%) need 10 iterations, except on Chrome OS where the
number is 12. These numbers are also an overestimate because they
count failed validations.

Other uses of this code have picked limits of 18 and 20. Set an
upper bound of 20, which is about twice what we have any evidence
of anyone needing. The current limit is far, far too high. On the
off chance this causes an issue, add a base::Feature kill switch for a
couple releases, but I think this otherwise does not need much fanfare.

Bug: 634470
Change-Id: Ie7dd23c52b6ac0a6d3319c01767b210b4718cc3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4903550
Reviewed-by: Matt Mueller <mattm@chromium.org>
Auto-Submit: David Benjamin <davidben@chromium.org>
Commit-Queue: David Benjamin <davidben@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1211710}
6 files changed
tree: b2f19061fb64c312a4bd41e9d66930c8826c9e62
  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. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gitmodules
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython3
  62. .yapfignore
  63. ATL_OWNERS
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. LICENSE
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md
  77. WATCHLISTS
README.md

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