Reland: [ad density] Record average-viewport-ad-density UKM

This is a reland for https://chromium-review.googlesource.com/c/chromium/src/+/3481259.

The only difference is that the AverageViewportAdDensity browsertest
is now disabled, as the flakiness was not easily reproducible (i.e.
tried to reproduce the timeout on the linux-lacros-xxx bots, by
putting the test logic inside a loop. But it still didn't hit any
blockage before being killed for running too long.)

(cherry picked from commit cbbd03f0d616422a5a7fc0f1b0d07158a1d505f9)

Bug: 1316362
Change-Id: Icc149bbe8492e26480b03515cd5e97d8a9d4a3cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3652752
Reviewed-by: John Delaney <johnidel@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Yao Xiao <yaoxia@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1007848}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3680646
Owners-Override: Krishna Govind <govind@chromium.org>
Commit-Queue: Krishna Govind <govind@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/5060@{#438}
Cr-Branched-From: b83393d0f4038aeaf67f970a024d8101df7348d1-refs/heads/main@{#1002911}
7 files changed
tree: c72e4721c51a3f0fd5f57c55a14b7ced60acbcbe
  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/
  22. fuchsia_webengine/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  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. .mailmap
  60. .rustfmt.toml
  61. .vpython
  62. .vpython3
  63. .yapfignore
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. ENG_REVIEW_OWNERS
  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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