Reland "Rewrite WallpaperColorCalculator with a Callback"

This reverts commit 1e1b18171fd6a21cb9a04feac389f9b53e668df8.

Reason for revert: Fix include path that landed with previous change.

Original change's description:
> Revert "Rewrite WallpaperColorCalculator with a Callback"
>
> This reverts commit 6223bc43bc975d53454056fcdef964beee3d5da8.
>
> Reason for revert:
> LUCI Bisection identified this CL as the culprit of a build failure. See the analysis: https://luci-bisection.appspot.com/analysis/b/8791606956156824721
>
> Sample failed build: https://ci.chromium.org/b/8791606956156824721
>
> If this is a false positive, please report it at https://bugs.chromium.org/p/chromium/issues/entry?comment=Analysis%3A+https%3A%2F%2Fluci-bisection.appspot.com%2Fanalysis%2Fb%2F8791606956156824721&components=Tools%3ETest%3EFindit&labels=LUCI-Bisection-Wrong%2CPri-3%2CType-Bug&status=Available&summary=Wrongly+blamed+https%3A%2F%2Fchromium-review.googlesource.com%2Fc%2Fchromium%2Fsrc%2F%2B%2F4164138
>
> Original change's description:
> > Rewrite WallpaperColorCalculator with a Callback
> >
> > Removes the Observer interface in favor of a callback since only one
> > client receives the result. Rewrite test to use RunLoop and
> > cleanup as appropriate.
> >
> > Bug: b:258750361
> > Change-Id: I719bdd1c16d0158f5ce2553725156c56fa9a5c53
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4164138
> > Reviewed-by: Jeffrey Young <cowmoo@google.com>
> > Commit-Queue: Sean Kau <skau@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#1093985}
> >
>
> Bug: b:258750361
> Change-Id: I696202d7c2acfcacb0fda54ad292d9e42719a0be
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4177691
> Owners-Override: luci-bisection@appspot.gserviceaccount.com <luci-bisection@appspot.gserviceaccount.com>
> Reviewed-by: Sean Kau <skau@chromium.org>
> Bot-Commit: luci-bisection@appspot.gserviceaccount.com <luci-bisection@appspot.gserviceaccount.com>
> Reviewed-by: Jeffrey Young <cowmoo@google.com>
> Commit-Queue: Sean Kau <skau@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1093991}

Bug: b:258750361
Change-Id: I3df4792bd6793b25ff08c5e77371fea01b4b630d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4177955
Reviewed-by: Jeffrey Young <cowmoo@google.com>
Commit-Queue: Sean Kau <skau@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1094036}
8 files changed
tree: a67df47260bea6cf7278fce52c655c86d2c309d3
  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. weblayer/
  51. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  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. DEPS
  68. DIR_METADATA
  69. LICENSE
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md
  76. WATCHLISTS
README.md

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The project's web site is https://www.chromium.org.

To check out the source code locally, don't use git clone! Instead, follow the instructions on how to get the code.

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