wayland ui scaling: add unit tests for per-surface scaling path

This is part of the set of changes required to support Desktop
Environment's "Large Text" accessibility setting in Chromium's Wayland
backend. It actually can also be triggered by other system tools, such
as, Gnome Tweaks app as well as gsettings command line tool in Gnome
ecosystem.

Design doc:
https://docs.google.com/document/d/16kwPm_S0dmxe4kSgKY0_PA7aFvkFcftx6AMzNqT8Nfg

This CL enhances the Wayland Ozone backend testing infra by making the
per-surface scaling code path (required by ui scaling) testable. Also, a
unit test for pure fractional-scale-v1 is added.

The ui scaling unit tests will be added in the upcoming CLs, which
implement the actual functionality.

R=edcourtney, orko@igalia.com

Bug: 40856031, 336007385
Change-Id: If8d6a86787f4e7269e45828241af22d0ae0c7b49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5871260
Reviewed-by: Orko Garai <orko@igalia.com>
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Eliot Courtney <edcourtney@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1357582}
7 files changed
tree: 2c4e8daf7abb11f20fdae7bb9ef9a0e24c7f7612
  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. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. google_update/
  24. gpu/
  25. headless/
  26. infra/
  27. ios/
  28. ipc/
  29. media/
  30. mojo/
  31. native_client_sdk/
  32. net/
  33. pdf/
  34. ppapi/
  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. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitallowed
  56. .gitattributes
  57. .gitignore
  58. .gitmodules
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython3
  63. .yapfignore
  64. ATL_OWNERS
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. CPPLINT.cfg
  70. CRYPTO_OWNERS
  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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