[iOS][safari-import] Register Safari import reminder with promos manager

This CL registers the Safari import entry-point modal with the promos
manager so that it would show again if user taps "Remind Me Later" when
they first see the modal.

Also fixes a few bugs in the current skeleton-coordinator's workflow.
Otherwise, when no current view is being presented, the coordinator
would start and stop before being assigned to the ivar, causing a crash.

UIBlocker and (conditional) FET dismissal logic is also added to the
coordinator to handle edge cases when promos should display. They will
be moved to the mediator in future CLs.

(Okay... I wanted to start small, but this CL ended up being quite a
refactor 😂)

Bug: 420703280
Change-Id: I69d4317b9471003c307ae823d9fa0d851e63d90c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6616806
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Ginny Huang <ginnyhuang@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1469077}
19 files changed
tree: 1cf6671d3c4d049289f5f4d4ae7c35594b3bf00f
  1. .github/
  2. android_webview/
  3. apps/
  4. ash/
  5. base/
  6. build/
  7. build_overrides/
  8. buildtools/
  9. cc/
  10. chrome/
  11. chromecast/
  12. chromeos/
  13. codelabs/
  14. components/
  15. content/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia_web/
  22. gin/
  23. google_apis/
  24. gpu/
  25. headless/
  26. infra/
  27. ios/
  28. ipc/
  29. media/
  30. mojo/
  31. native_client_sdk/
  32. net/
  33. pdf/
  34. ppapi/
  35. printing/
  36. remoting/
  37. rlz/
  38. sandbox/
  39. services/
  40. skia/
  41. sql/
  42. storage/
  43. styleguide/
  44. testing/
  45. third_party/
  46. tools/
  47. ui/
  48. url/
  49. webkit/
  50. .clang-format
  51. .clang-tidy
  52. .clangd
  53. .git-blame-ignore-revs
  54. .gitallowed
  55. .gitattributes
  56. .gitignore
  57. .gitmodules
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython3
  62. .yapfignore
  63. ATL_OWNERS
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. CPPLINT.cfg
  69. CRYPTO_OWNERS
  70. DEPS
  71. DIR_METADATA
  72. LICENSE
  73. LICENSE.chromium_os
  74. OWNERS
  75. PRESUBMIT.py
  76. PRESUBMIT_test.py
  77. PRESUBMIT_test_mocks.py
  78. README.md
  79. SECURITY_OWNERS
  80. WATCHLISTS
README.md

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