Reapply "[layout] Enable block layout buttons."

This reverts commit f97fd9eae16c3aa3a08ec983e9fff00b7e3d7bb9.

This additionally adjusts the flakey test:
third_party/blink/web_tests/fast/forms/color/color-picker-top-left-selection-position-after-reopen.html

To include some margin. The test non-deterministically inserts a
2-line button next to the <input type=color>. The with the flag
enabled pushed the color input down (as baseline alignment is now
different), and would then get removed, making the chooser seem to be
placed incorrectly. The additional margin prevents this shift from
occurring.

Original change's description:
> [layout] Enable block layout buttons.
>
> This enables block layout buttons by default.
>
> This fixes two WPT tests:
> html/rendering/widgets/button-layout/anonymous-button-content-box.html
> html/rendering/widgets/button-layout/inline-level.html
>
> The control-clip rebaseline is due to the content not painting
> atomically anymore (vs. flex-items which do).
>
> Bug: 41458734, 40937312
> Change-Id: I4668cf7cecd4fa79a73c0683bdcac9b79bd2ade1
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5494533
> Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
> Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1294308}

Bug: 41458734, 40937312, 338299516
Change-Id: I54b687ad0842feadd0901ab3f4b705897537b363
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5524034
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1298138}
22 files changed
tree: 5e1d11f9de4490317fc9825d7e5b0da7f2dd76da
  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. .clangd
  54. .eslintrc.js
  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. DEPS
  72. DIR_METADATA
  73. LICENSE
  74. LICENSE.chromium_os
  75. OWNERS
  76. PRESUBMIT.py
  77. PRESUBMIT_test.py
  78. PRESUBMIT_test_mocks.py
  79. README.md
  80. WATCHLISTS
README.md

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