[mobar] Hide edge to edge chin completely when keyboard is visible

Currently, the chin's layer visibility is "visible when others visible"
when the soft keyboard is up. This effectively hides it because all the
other layers either move or hide when the keyboard is up:
* Readaloud and tabgroup strip hide
* Toolbar moves to the top and is hidden as far as the stacker is
  concerned

For mini origin bar, the toolbar needs to stay on the botom, so this
logic no longer works. The chin remains at the bottom of the screen,
under the keyboard, but offsets the toolbar by its height, leaving a
visible gap.

To address this, we can fully hide the chin when the keyboard is up.

Bug: 411202039
Change-Id: I67d08b6f2d0343f7794c2ee7cd1234ae562f3189
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6472851
Commit-Queue: Patrick Noland <pnoland@chromium.org>
Reviewed-by: Wenyu Fu <wenyufu@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1449496}
2 files changed
tree: 56a387706c1b3ac0d944665cc896e2d5052287f0
  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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