Reland "[ntp] Add interactive UI test for NTP mobile promo"

This is a reland of commit b51bb0374ea679ad0355a47457207809006fad91

The original CL waited for the elements to load, but there may be some
rendering delay (e.g. transitions), which cause further interactions
to fail. This new CL now waits for the elements to render on the page,
which should fix the flakes in the original CL.

Original change's description:
> [ntp] Add interactive UI test for NTP mobile promo
>
> Bug: 376291361
> Change-Id: Ia68f3e72dcc5bdfbe95d29bf86e0b4f03ba5819f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5972982
> Reviewed-by: Paul Adedeji <pauladedeji@google.com>
> Commit-Queue: Robbie Gibson <rkgibson@google.com>
> Cr-Commit-Position: refs/heads/main@{#1377141}

Bug: 376291361
Change-Id: Ic81d6a9473e551a6b1dbac7087f0615d4c4eb6fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5988990
Reviewed-by: Paul Adedeji <pauladedeji@google.com>
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Cr-Commit-Position: refs/heads/main@{#1378375}
2 files changed
tree: 21db20d51b52b96814e51d962cb259eadc38b4db
  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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