[Save and Fill] Add pending state throbber

This CL introduces a pending state with a throbber shown during the
pre-flight response fetching. Upon result, the dialog transitions to
either a local version (on preflight failure) or a server dialog (on
preflight success).

Mock: https://screenshot.googleplex.com/9mtoeZRBGM8Cj6L.png
w/o the GPay logo
Implementation (when preflight fails):
http://screencast/cast/NTA2NzA4NzgwMTIyMTEyMHwxZTlhNDBjYy00ZQ
Implementation (when preflight succeeds):
http://screencast/cast/NjM0NDk4NTU2MDQ4MTc5MnxkMmM4ZGUzYy05YQ

Design doc: go/payments-autofill-save-and-fill-desktop-design

Bug: 378164165
Change-Id: I3d44efb672e87ccce030176c96d94b66c58d9665
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6794465
Reviewed-by: Siyu An <siyua@chromium.org>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Commit-Queue: Verina Armanyous <averina@google.com>
Cr-Commit-Position: refs/heads/main@{#1495716}
11 files changed
tree: e5d0a3d8b4b665e6414308a2de9391f5d777a530
  1. .github/
  2. agents/
  3. android_webview/
  4. apps/
  5. ash/
  6. base/
  7. build/
  8. build_overrides/
  9. buildtools/
  10. cc/
  11. chrome/
  12. chromecast/
  13. chromeos/
  14. codelabs/
  15. components/
  16. content/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia_web/
  23. gin/
  24. google_apis/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. media/
  31. mojo/
  32. net/
  33. pdf/
  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. .cursorignore
  53. .geminiignore
  54. .git-blame-ignore-revs
  55. .gitallowed
  56. .gitattributes
  57. .gitignore
  58. .gitmodules
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython3
  63. .yapfignore
  64. ATL_OWNERS
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. CPPLINT.cfg
  70. CRYPTO_OWNERS
  71. DEPS
  72. DIR_METADATA
  73. LICENSE
  74. LICENSE.chromium_os
  75. OWNERS
  76. PRESUBMIT.py
  77. PRESUBMIT_test.py
  78. PRESUBMIT_test_mocks.py
  79. README.md
  80. SECURITY_OWNERS
  81. WATCHLISTS
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