[ios][mim] Add code to open selected profile in a new window

This CL implements switchProfileButtonWasTapped by:
 - Updating the kBrowserStateLastUsed key
 - Opening a new window (creating a new scene)
 - Updating code in startUpChromeUI (in SceneController) to get the
   browserState from ChromeBrowserStateManager. Note that there is no
   change compared to old code in SceneController because the AppState
   gets the browserState in the same way.

Note that this is not a final solution, but only a temporary solution
that will be helpful to test some features until we have the correct
APIs (and with minimal code changes outside of ../multi_identity/*).

Note that:
 - It will be possible to test this code only on
   iPad since we need multi-window support.
 - This code opens a new window with a new sceneState associated to
   a browserState different from the one in the first window. It
   is not linked to user logged-in (so we can't test login/logout etc)

Bug: 333520714
Change-Id: Ia6e51ec31392de237d8a56cd20eba6cf3d5a04ab
Low-Coverage-Reason: EXPERIMENTAL_CODE
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5641336
Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Federica Germinario <fedegermi@google.com>
Cr-Commit-Position: refs/heads/main@{#1318492}
8 files changed
tree: c1a716e3e72b7d90a038295408f60e073bbc4c91
  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_web/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. media/
  31. mojo/
  32. native_client_sdk/
  33. net/
  34. pdf/
  35. ppapi/
  36. printing/
  37. remoting/
  38. rlz/
  39. sandbox/
  40. services/
  41. skia/
  42. sql/
  43. storage/
  44. styleguide/
  45. testing/
  46. third_party/
  47. tools/
  48. ui/
  49. url/
  50. webkit/
  51. .clang-format
  52. .clang-tidy
  53. .clangd
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitallowed
  57. .gitattributes
  58. .gitignore
  59. .gitmodules
  60. .gn
  61. .mailmap
  62. .rustfmt.toml
  63. .vpython3
  64. .yapfignore
  65. ATL_OWNERS
  66. AUTHORS
  67. BUILD.gn
  68. CODE_OF_CONDUCT.md
  69. codereview.settings
  70. CPPLINT.cfg
  71. DEPS
  72. DIR_METADATA
  73. LICENSE
  74. LICENSE.chromium_os
  75. OWNERS
  76. PRESUBMIT.py
  77. PRESUBMIT_test.py
  78. PRESUBMIT_test_mocks.py
  79. README.md
  80. WATCHLISTS
README.md

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