[ntp footer] Hide footer section from Customize Chrome side panel

Adds 'NewTabPageType' enum to classify the NTP type the side panel is
attached to. The footer section will only be shown for extension NTPs.

Footer toggle shown on extension ntp:
https://screenshot.googleplex.com/8cEH6z4n2t6k6Fr

Footer toggle hidden:
https://screenshot.googleplex.com/4iaEaDNbuAtMkMA

Bug: 400952431
Change-Id: I59e0e3825d8aca17e03388b42c9241d2dc99da58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6464147
Reviewed-by: Paul Adedeji <pauladedeji@google.com>
Reviewed-by: Fred Shih <ffred@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Commit-Queue: Jennifer Serrano <jennserrano@google.com>
Cr-Commit-Position: refs/heads/main@{#1451405}
15 files changed
tree: 59d1a8cd141db2d4110af85e95ea25767f76e56b
  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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