Move experimental WebGPU features behind a new blink runtime feature

This CL gates the following WebGPU experimental features from
WebGPUDeveloperFeatures to new WebGPUExperimentalFeatures blink runtime
feature to assess those are meant to land in the WebGPU spec and not
for development purposes:
- GPUAdapter.isCompatibilityMode
- GPUCommandEncoder.writeTimestamp()
- GPUComputePipelineDescriptor.requiresFullSubgroups
- GPURequestAdapterOptions.compatibilityMode
- GPUSupportedLimits.minSubgroupSize
- GPUSupportedLimits.maxSubgroupSize
- GPUTextureDescriptor.textureBindingViewDimension

Change-Id: I3b5ba3dffbc7c68d366c75d735cb06568234b859
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5233480
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Fr <beaufort.francois@gmail.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Wanda Mora <morawand@google.com>
Cr-Commit-Position: refs/heads/main@{#1252258}
20 files changed
tree: 0687df16190f91f661179d007a8c0dfbebd29566
  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. DEPS
  71. DIR_METADATA
  72. LICENSE
  73. LICENSE.chromium_os
  74. OWNERS
  75. PRESUBMIT.py
  76. PRESUBMIT_test.py
  77. PRESUBMIT_test_mocks.py
  78. README.md
  79. WATCHLISTS
README.md

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