[Thumbnails] Refactor ThumbnailProvider and Fetcher

Refactor ThumbnailProvider and ThumbnailFetcher to use a more
conventional argument order where the callback is the last argument.
Change the callback everywhere to take a Drawable rather than a Bitmap
in preparation for MultiThumbnailProvider to return a LayerDrawable
instead of a BitmapDrawable in the future.

Create a standalone ThumbnailFetcher to replace
TabListMediator.ThumbnailFetcher. The new fetcher supports cancelation
of in-flight callbacks and a follow-up CL will call cancel
appropriately when the THUMBNAIL_FETCHER is changed.

Bug: 342450242
Change-Id: I151e77f1d4d3814746d2f077a81d4ce36571cb21
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5792463
Reviewed-by: Xi Han <hanxi@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Brandon Wylie <wylieb@google.com>
Cr-Commit-Position: refs/heads/main@{#1343588}
31 files changed
tree: 8f814f5d2a5faafae39f1a8b5dd031d5ddf71782
  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. CRYPTO_OWNERS
  72. DEPS
  73. DIR_METADATA
  74. LICENSE
  75. LICENSE.chromium_os
  76. OWNERS
  77. PRESUBMIT.py
  78. PRESUBMIT_test.py
  79. PRESUBMIT_test_mocks.py
  80. README.md
  81. WATCHLISTS
README.md

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