[iOS] [WebChannels] Record follow count histogram and user action

Records the number of followed publishers when:
1. Selecting Following feed and content is shown
2. Selecting Following feed and no content is shown
3. Following a channel
4. Unfollowing a channel
5. Engaging with the Following feed

Uses a new FollowDelegate so that the NTPCoordinator can make calls to
the FollowProvider on behalf of the FeedMetricsRecorder. Follow/Unfollow
channels will be logged in a separate CL.

Also logs user actions for each feed being selected from the header.

(cherry picked from commit fc35eb0750f077c4c1b09c2f0f2cb05267757f22)

Bug: 1322640
Change-Id: Idc696e46b9a743dda89e6277608612ee99051425
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3644971
Commit-Queue: Adam Arcaro <adamta@google.com>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Dan H <harringtond@chromium.org>
Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#1004531}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3655701
Commit-Queue: Tina Wang <tinazwang@chromium.org>
Cr-Commit-Position: refs/branch-heads/5060@{#190}
Cr-Branched-From: b83393d0f4038aeaf67f970a024d8101df7348d1-refs/heads/main@{#1002911}
10 files changed
tree: 6d47bb75f51ec68c606f85610fd3ae2b5c8fe3a8
  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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