[AppList Sync] Refactor on sync position ownership

Currently both ChromeAppListModelUpdater and ash classes are able to
modify sync positions (i.e. StringOrdinal positions that are synced
among devices) so the ownership is unclear. The similar issues also
happen on other app list item attributes.

This CL creates a delegate class called `AppListModelDelegate` used for
app list item update initiated from ash (such as changing an item's
position during mouse drag). `AppListModelDelegate` relays the item
update requests to the browser side.

In this CL, `AppListModelDelegate` only contains the function related to
item position. In the subsequent CLs, we should let
`AppListModelDelegate` update other item attributes as well.

Read the doc attached to the issue for further details.

Bug: 1251205
Change-Id: Ib7bc4597f050426e777b9b01c9ef7f28d69e17c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3171260
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/main@{#930175}
29 files changed
tree: 9fdbcba42116721f418e12dd1702d7bba165addd
  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. cloud_print/
  13. codelabs/
  14. components/
  15. content/
  16. courgette/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. jingle/
  32. media/
  33. mojo/
  34. native_client_sdk/
  35. net/
  36. pdf/
  37. ppapi/
  38. printing/
  39. remoting/
  40. rlz/
  41. sandbox/
  42. services/
  43. skia/
  44. sql/
  45. storage/
  46. styleguide/
  47. testing/
  48. third_party/
  49. tools/
  50. ui/
  51. url/
  52. weblayer/
  53. .clang-format
  54. .clang-tidy
  55. .eslintrc.js
  56. .git-blame-ignore-revs
  57. .gitattributes
  58. .gitignore
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython
  63. .vpython3
  64. .yapfignore
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. DEPS
  70. DIR_METADATA
  71. ENG_REVIEW_OWNERS
  72. LICENSE
  73. LICENSE.chromium_os
  74. OWNERS
  75. PRESUBMIT.py
  76. PRESUBMIT_test.py
  77. PRESUBMIT_test_mocks.py
  78. README.md
  79. WATCHLISTS
README.md

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