Record PageLoad metrics w/ TranslateMetricsLogger

Added and translate_metrics_logger_ private member following TranslatePageLoadMetricsObserver. Correspondences:
DidStartNavigation <-> OnStart, DidFinishNavigation <-> OnCommit, DidStartNavigation/WebStateDestroyed <-> OnComplete.

TranslateMetricsLogger lifetime tied to page load via ChromeIOSTranslateClient::DidStartNavigation.

(cherry picked from commit dd427e94a0a05152993d0b31d341a32d1145a5b8)

Bug: 1326717
Test: Build iOS simulator, run Chromium, navigate to chrome://histograms/Translate.PageLoad, then any website in a new tab, then refresh chrome://histograms/Translate.PageLoad tab. Automated unit tests: build and run ios_chrome_unittests with --gtest_filter="ChromeIOSTranslateClientTest.*" flag.
Change-Id: Ie7652a2545f094e4226abd0820a5b2020460baa9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3662122
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Reviewed-by: Trevor Perrier <perrier@chromium.org>
Reviewed-by: Raj T <rajendrant@chromium.org>
Commit-Queue: Zhixiang Teoh <zhteoh@google.com>
Cr-Original-Commit-Position: refs/heads/main@{#1008509}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3684613
Commit-Queue: Raj T <rajendrant@chromium.org>
Cr-Commit-Position: refs/branch-heads/5060@{#470}
Cr-Branched-From: b83393d0f4038aeaf67f970a024d8101df7348d1-refs/heads/main@{#1002911}
4 files changed
tree: 8b80e3b37a3d4702e42646caa61d41cee2dbdfb4
  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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