Cherrypick of fixes for wallpaper search entry point colors

This squashes the following CLs:

> make wallpaper search NTP button visible in high contrast mode
>
> http://screenshot/6JkvsZbvGeXqpQb
>
> Bug: 330008140
> Change-Id: I06095fbf1aa20e0a05daef1023fa978d789c7651
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5385166
> Reviewed-by: John Lee <johntlee@chromium.org>
> Commit-Queue: Riley Tatum <rtatum@google.com>
> Cr-Commit-Position: refs/heads/main@{#1276530}
> (cherry picked from commit e7876f17e150bb948ec5a7940bdc304bc00bb949)


> Add a GM2 color for the wallpaper search button.
>
> Fixes issue where users might see a red wallpaper search button if they haven't updated to a GM3 theme.
>
> Spec is in bug comments
>
> non-white bg: screenshot/A4SjMne9TdVzf3x
> theme w/ white bg: screenshot/A3z44FPN6EwrrKs
>
> Change-Id: I690c86f33c3d7ae2ab7cce247850f26145333b6c
> Bug: 330008140
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5379349
> Auto-Submit: Paul Adedeji <pauladedeji@google.com>
> Commit-Queue: Roman Arora <romanarora@chromium.org>
> Reviewed-by: Peter Kasting <pkasting@chromium.org>
> Reviewed-by: Roman Arora <romanarora@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1275776}
> (cherry picked from commit f5e2036b6c3f25dc04b28e36c8b3ec4dffbcb038)

Bug: 330008140
Change-Id: I7ae47212203259859625a746e49306361dc98b48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5392701
Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
Commit-Queue: Riley Tatum <rtatum@google.com>
Cr-Commit-Position: refs/branch-heads/6312@{#698}
Cr-Branched-From: 6711dcdae48edaf98cbc6964f90fac85b7d9986e-refs/heads/main@{#1262506}
4 files changed
tree: 2da5ea0e86ff9cdcbcda27022f4d0a31e8577813
  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. DEPS
  71. DIR_METADATA
  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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