[SurfacePolish] Polish real omnibox's logo and search text on Start Surface and NTP(phone)

This CL includes the following tasks:
1. Add a white background for the G logo in the real search box when scrolling up either NTP or Start Surface in light mode. We also made its width smaller and the animation looks correct when scrolling up.
2. Change the real search box's search text style and color for both Start and NTP.

Screenshot link:
https://docs.google.com/document/d/1dKnYF_WH6KNOLqxx9Wd2w0fhWQZ0rZPyzJjBgr5kSMM/edit?usp=sharing&resourcekey=0-gEng3KQzXlKf7a7KOgLaiQ

Bug: 1449683
Change-Id: Ice575cc4f01fc4ed889739c1e08837128c37c0ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4882139
Reviewed-by: Brandon Wylie <wylieb@chromium.org>
Commit-Queue: Xinyi Ji <xinyiji@chromium.org>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Theresa Sullivan <twellington@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1203596}
15 files changed
tree: cedf70e6560483d717c8590fe659931d8c2facea
  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. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gitmodules
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython3
  62. .yapfignore
  63. ATL_OWNERS
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. LICENSE
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md
  77. WATCHLISTS
README.md

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