[M136] [omnibox] Add joint slicing for `Omnibox.SuggestionShown` metric.

Original change's description:
> [omnibox] Add joint slicing for `Omnibox.SuggestionShown` metric.
> 
> In order to support deeper analysis of the `Omnibox.SuggestionShown`
> metric, this CL adds the ability to slice by both
> ClientSummarizedResultType and page context.
> 
> This enables us to answer questions like: Did the user see at least one
> Search/URL suggestion, during the course of the Omnibox session, when
> they selected a suggestion in the given page context?
> 
> In the long-term, we'll likely be moving these key Omnibox metrics
> server-side, but for now we're implementing these client-side in the
> interest of supporting Stable experimentation ASAP.
> 
> Bug: 402519775
> Change-Id: I829cc675ae86da6f5a0e1c71a0eb777613cf3195
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6439233
> Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
> Commit-Queue: Khalid Peer <khalidpeer@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1444926}

Bug: 409787568,402519775
Change-Id: I829cc675ae86da6f5a0e1c71a0eb777613cf3195
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6449574
Auto-Submit: Chrome Cherry Picker <chrome-cherry-picker@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/7103@{#849}
Cr-Branched-From: e09430c64983fc906f37a9f7e6806275c9b67b86-refs/heads/main@{#1440670}
3 files changed
tree: f8021350723e0192996e688d27dd98bf9116c848
  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. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. gpu/
  24. headless/
  25. infra/
  26. ios/
  27. ipc/
  28. media/
  29. mojo/
  30. native_client_sdk/
  31. net/
  32. pdf/
  33. ppapi/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .git-blame-ignore-revs
  53. .gitallowed
  54. .gitattributes
  55. .gitignore
  56. .gitmodules
  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. CPPLINT.cfg
  68. CRYPTO_OWNERS
  69. DEPS
  70. DIR_METADATA
  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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