[Export Tagged PDFs] Extend structured PDF testing to include attributes

Objects in PDF can have attributes, and although we write some of these
attribute, we do not test the output. This CL extends the algorithm used
to produce JSON of the structure data used for testing to include
attribute data.

Also added new overloads for
CallPDFiumWideStringBufferApiAndReturnOptional and
CallPDFiumStringBufferApiAndReturnOptional to handle the PDFium API
patterns related to attribute name strings and attribute value strings.

Bug: 443772810
Change-Id: Ia80b45a328264c06d3aedde813df6cadaa902faa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6981634
Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Peter Kvitek <kvitekp@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Valerie Young <spectranaut@igalia.com>
Cr-Commit-Position: refs/heads/main@{#1526523}
4 files changed
tree: 3ba669517e63a582b6f0c42b52f647ef0d3c9734
  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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