[M123]Fix when and how some readaloud histograms are emitted

- Eligibility is now logged when profile is available
- Readability was previously biased towards logging ineligible pages (from the client side optimizations). Now we first check if feature is enabled at all and all required objects initialized before we log readability, and to remove bias, we also log it for cached results.
- New histogram for server side readability rate is added


(cherry picked from commit c8aec78d412fac262ff3eec3a26da0121ed99a28)

Bug: 328264691
Bug: 328264863
Change-Id: Ia3aaf2f762d3c01683fced9ee08cfc7f5057b04f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5346496
Reviewed-by: Ian Wells <iwells@chromium.org>
Reviewed-by: Andrea Gomez <andreaxg@google.com>
Commit-Queue: Basia Zimirska <basiaz@google.com>
Cr-Original-Commit-Position: refs/heads/main@{#1268694}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5352705
Cr-Commit-Position: refs/branch-heads/6312@{#517}
Cr-Branched-From: 6711dcdae48edaf98cbc6964f90fac85b7d9986e-refs/heads/main@{#1262506}
4 files changed
tree: a259adcab9625be9fe64c85af61d6bb22973b210
  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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