[PhoneHub][Nudge] Implemented Phone Hub nudge metrics

Implemented metrics for Phone Hub nudge according to PRD:
go/phone-hub-nudge-prd. After this CL, we should be able to calculate
metrics for:
1). Number of nudges being shown
2). Percentage of nudges are clicked (on nudge or Phone Hub icon).
4). Number of click on nudge.
5). Number of clicks on Phone Hub icon.
6). Average time for action after nudge is shown.
7). Average shown times before first action.
8). Number of actions for setup notification (on notification or
    Phone Hub icon)

that data were correctly logged to corresponding buckets.

Tested: manually tested on DUT and verified in chrome://histograms
Bug: b/279935959, b/279935749
Change-Id: Id645898c5ea60026a4861ba972744ed8a8187748
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4522050
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Crisrael Lucero <crisrael@google.com>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Jon Mann <jonmann@chromium.org>
Commit-Queue: Pu Shi <pushi@google.com>
Cr-Commit-Position: refs/heads/main@{#1179949}
15 files changed
tree: 0e95d7881c4514e6c1cf13fd10ac142911dfd1a0
  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. weblayer/
  51. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  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. DEPS
  68. DIR_METADATA
  69. LICENSE
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md
  76. WATCHLISTS
README.md

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