[lensoverlay] Fix the "invisible searchbox" issue and adjust styling.

Before: https://screenshot.googleplex.com/7CVLwCqxngZUvZC.png
After: https://screenshot.googleplex.com/8TPumjrN6c5zCRj.png

Specifies the searchbox colors in the side panel HTML rather than
relying on the CSS file import, which doesn't work reliably. It's not
clear what's the right approach long term, it may depend on whether we
need to be responsive to theming or not. If so, I'll need to diagnose
and fix the import issue. If not, we may be able to just rely on these
new local color definitions.

Also makes several other changes that move the UI closer to spec:
- Sets "realboxCr23HoverFillShape" to false.
- Sets "realboxDefaultIcon" to the Google G.
- Replaces the "Search Google or type a URL" hint text with "Search
  Google". This is just a temporary change until the strings are
  finalized.
- Introduces a new "searchboxInSidePanel" data source value that drives
  some tweaks to the size and position of elements in the searchbox when
  it's being shown in the side panel.

Bug: b:337291041, b:337657623
Change-Id: Iccc0ffa9c90fce802cb0b0a19443eab8e0cc5114
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5494913
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Nihar Majmudar <niharm@google.com>
Commit-Queue: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1293817}
7 files changed
tree: 14926253907686f920eb1cd3bdd24e3e7a77cc4f
  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. CPPLINT.cfg
  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. WATCHLISTS
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