[M137] Add LoadingFromCommandLine histogram

The new Extensions.LoadingFromCommandLine histogram replaces the
previous LoadingFromCommandLineBlocked histogram, which recorded whether
commandline extensions were blocked or not (it should have emitted in
both cases, not just the blocked case). The new histogram will only be
emitted if the commandline loading flags are present and the loading of
commandline extensions is not blocked (due to restrictions or policy).

The histogram records a new enum value LoadExtensionFlag, which
represents either the `--load-extension` or
`--disable-extensions-except` flag.

OBSOLETE_HISTOGRAM[Extensions.LoadingFromCommandLineBlocked]=Replaced by
Extensions.LoadingFromCommandLine

(cherry picked from commit 0d00066f401eea0d90e12ee4331a5d1636b0b028)

Bug: 401529219
Fixed: 422991756
Change-Id: I2c2991898720e87fa07ccf893e4c92114d975673
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6605723
Commit-Queue: Richard Chen <richche@google.com>
Reviewed-by: Anunoy Ghosh <anunoy@chromium.org>
Reviewed-by: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Devlin Cronin <rdevlin.cronin@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1470340}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6628311
Reviewed-by: Lei Zhang <thestig@chromium.org>
Owners-Override: Srinivas Sista <srinivassista@chromium.org>
Auto-Submit: Richard Chen <richche@google.com>
Commit-Queue: Srinivas Sista <srinivassista@chromium.org>
Cr-Commit-Position: refs/branch-heads/7151@{#1957}
Cr-Branched-From: 8e0d32ed6e49a2415b16e5ed402957cac2349ce2-refs/heads/main@{#1453031}
5 files changed
tree: 75b523f89b8be81b017f87820366743ef4f96211
  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. gpu/
  24. headless/
  25. infra/
  26. ios/
  27. ipc/
  28. media/
  29. mojo/
  30. native_client_sdk/
  31. net/
  32. pdf/
  33. ppapi/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .git-blame-ignore-revs
  53. .gitallowed
  54. .gitattributes
  55. .gitignore
  56. .gitmodules
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. CPPLINT.cfg
  68. CRYPTO_OWNERS
  69. DEPS
  70. DIR_METADATA
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
README.md

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