Protected Audience: Prepare contexts on seller worklet

While we download trusted scoring signals, we can use that time
to prepare seller contexts. This change is similar to
https://chromium-review.googlesource.com/c/chromium/src/+/5995411
which prepared bidder contexts, but unlike in the bidder
worklet, we don't need to do any estimation of the number
of contexts we'll need, because there is no filtering step.

Bug: 381063093
Change-Id: I7be1488a83e56345e1ba106c9a6dfd917433dd66
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6051062
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Commit-Queue: Abigail Katcoff <abigailkatcoff@chromium.org>
Reviewed-by: Orr Bernstein <orrb@google.com>
Cr-Commit-Position: refs/heads/main@{#1390417}
6 files changed
tree: b2953b8875883f39ab11241b19e1ef6d269e8d83
  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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