[TabGroupController updates] Invert observer calls in Add/RemoveTab

Currently the TabGroup object calls TabStripModel observer methods when
updating. When using TabGroups on other platforms, we no longer need
or want to call these methods. To support this, we remove those
method calls from TabGroup and perform the action on the TSM after
the tab group methods are called.

TabGroupVisualsChanged method is named OnTabGroupVisualsChanged to
signify that the action has already occurred, and a comment is added
(this should be changed once we can remove the VisualsChanged from
controller).

Other notifications methods are renamed to "Notify<verb>" for groups.

Bug: 417235218
Change-Id: I24c997a1c1ed5af02ab99d6e722519d7611e9caa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6533002
Commit-Queue: David Pennington <dpenning@chromium.org>
Reviewed-by: Shibalik Mohapatra <shibalik@chromium.org>
Reviewed-by: Eshwar Stalin <estalin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1459799}
4 files changed
tree: d516876c285e612f54a73554ac7b479d7fdb18e7
  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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