[SVG] Add UseCounter for CSS sizing on nested <svg> elements

This CL introduces a UseCounter to track the usage of CSS sizing
styles specifically `width` and `height` applied to nested <svg>
elements. The collected data will help assess the potential impact
of enabling the feature
`WidthAndHeightAsPresentationAttributesOnNestedSvg`, which allows
these attributes to behave as presentation attributes on inner SVGs.

By measuring how frequently this styling pattern appears across
webpages, we can better understand compatibility risks and make
informed decisions about feature rollout and developer
communication.

Note: To ensure that UseCounter functions correctly, we are
explicitly collecting sizing styles for nested <svg> elements. To
prevent any potential issues arising from this change, the
collection of sizing styles has been gated behind a runtime feature
flag: `CollectWidthAndHeightAsStylesForNestedSvg`.

Bug: 450130878
Change-Id: I2ab3e7094c5e6aeb34b6690f2c11950185db1b58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7005609
Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Fredrik Söderquist <fs@opera.com>
Commit-Queue: Divyansh Mangal <dmangal@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#1528554}
8 files changed
tree: 3e49ee667bb3f8c9b345d85ba5376ff80051674d
  1. .gemini/
  2. .github/
  3. agents/
  4. android_webview/
  5. apps/
  6. ash/
  7. base/
  8. build/
  9. build_overrides/
  10. buildtools/
  11. cc/
  12. chrome/
  13. chromecast/
  14. chromeos/
  15. codelabs/
  16. components/
  17. content/
  18. crypto/
  19. dbus/
  20. device/
  21. docs/
  22. extensions/
  23. fuchsia_web/
  24. gin/
  25. google_apis/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. media/
  32. mojo/
  33. net/
  34. pdf/
  35. printing/
  36. remoting/
  37. rlz/
  38. sandbox/
  39. services/
  40. skia/
  41. sql/
  42. storage/
  43. styleguide/
  44. testing/
  45. third_party/
  46. tools/
  47. ui/
  48. url/
  49. webkit/
  50. .clang-format
  51. .clang-tidy
  52. .clangd
  53. .cursorignore
  54. .geminiignore
  55. .git-blame-ignore-revs
  56. .gitallowed
  57. .gitattributes
  58. .gitignore
  59. .gitmodules
  60. .gn
  61. .mailmap
  62. .rustfmt.toml
  63. .vpython3
  64. .yapfignore
  65. ATL_OWNERS
  66. AUTHORS
  67. BUILD.gn
  68. CODE_OF_CONDUCT.md
  69. codereview.settings
  70. CPPLINT.cfg
  71. CRYPTO_OWNERS
  72. DEPS
  73. DIR_METADATA
  74. LICENSE
  75. LICENSE.chromium_os
  76. OWNERS
  77. PRESUBMIT.py
  78. PRESUBMIT_test.py
  79. PRESUBMIT_test_mocks.py
  80. README.md
  81. SECURITY_OWNERS
  82. WATCHLISTS
README.md

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