[css-grid] Fix line name positions after implicit tracks

When serializing grid-template-rows/columns of a grid container, we get
the list of used track sizes, and then insert line names at the
corresponding indices.

Before this patch, these indices were simply taken from the computed
value. However, leading implicit tracks appear in the used value but not
in the computed one. Therefore, we have to offset the indices so that
the line names appear at the proper positions.

BUG=790988

TEST=external/wpt/css/css-grid/parsing/grid-template-columns-computed-implicit-track.html
TEST=external/wpt/css/css-grid/parsing/grid-template-rows-computed-implicit-track.html

Change-Id: I778c73034c7ff9fc11a7d8a46a4042cfd1bcd1ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863092
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Reviewed-by: Javier Fernandez <jfernandez@igalia.com>
Reviewed-by: Manuel Rego <rego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#777829}
4 files changed
tree: e8650c4395f498d95678b0f62c50f78984590262
  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. DEPS
  66. ENG_REVIEW_OWNERS
  67. LICENSE
  68. LICENSE.chromium_os
  69. OWNERS
  70. PRESUBMIT.py
  71. PRESUBMIT_test.py
  72. PRESUBMIT_test_mocks.py
  73. README.md
  74. WATCHLISTS
  75. codereview.settings
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