[WebOTP] Record timing related UKMs

There are UMA metrics to measure the duration from when the API is
called to when the SMS is received / a user clicks "Allow" to complete
the flow. We want to add corresponding UKMs to help with the feature
adoption.

Note that the UKM that records the duration from when the API is called
to when a user clicks "Deny" to abort the flow will be added in a
follow up patch after crrev.com/c/2428825.

UKM collection review:
https://docs.google.com/document/d/15orQiLx06QSuZr4ShBaozY0dvPzXiTWwJZ9Xk5cgzAA/edit?usp=sharing

(cherry picked from commit a9fafab17f1d8e5fa26a09c1b19db22ca960c5a9)

Bug: 1127402
Change-Id: I204bd469ca203182eba6a37f3522d7a492cc937d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429236
Reviewed-by: Alexei Svitkine <[email protected]>
Reviewed-by: Ken Buchanan <[email protected]>
Reviewed-by: Sam Goto <[email protected]>
Reviewed-by: Majid Valipour <[email protected]>
Commit-Queue: Yi Gu <[email protected]>
Cr-Original-Commit-Position: refs/heads/master@{#814701}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462315
Reviewed-by: Yi Gu <[email protected]>
Cr-Commit-Position: refs/branch-heads/4280@{#167}
Cr-Branched-From: ea420fb963f9658c9969b6513c56b8f47efa1a2a-refs/heads/master@{#812852}
9 files changed
tree: 16e800ac5e5d3ce535e9a9d21f487769b6e008a6
  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. cloud_print/
  13. components/
  14. content/
  15. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. jingle/
  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. .vpython
  60. .vpython3
  61. .yapfignore
  62. AUTHORS
  63. BUILD.gn
  64. CODE_OF_CONDUCT.md
  65. codereview.settings
  66. DEPS
  67. DIR_METADATA
  68. ENG_REVIEW_OWNERS
  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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