shortcuts: Better input hints while inputting keys

* Remove some validation in handleKey(frontend) to allow certain
  invalid accelerators (e.g., shift+j) to pass through and be handled
  by the backend.

* Improve the input hint messages for different cases:
   case 1: Single key -> not a valid accelerator and won't be
           processed. But we also have a backup check in backend:
           kMissingModifier
   case 2: Shift + key -> kShiftOnlyNotAllowed
   case 3. Modifiers + top_row_key -> kKeyNotAllowed
   case 4. Conflict with locked keys -> kConflict
   case 5: Conflict with editable accelerator -> kConflictCanOverride
   case 6. More than 5 accelerators added ->
           kMaximumAcceleratorsReached
   case 7. Other cases -> kSuccess

* Video: http://go/scrcast/NDkwMTE0NjE1OTIxODY4OHwzY2M2YzNkYS1kMw

Bug: b/216049298
Test: browser_tests --gtest_filter=ShortcutCustomizationApp*
Change-Id: Ib593772b148b5ffdc58714f5499aaaf6e5305c50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4567070
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Commit-Queue: Longbo Wei <longbowei@google.com>
Cr-Commit-Position: refs/heads/main@{#1151612}
3 files changed
tree: de2650a7e13da2aed939e45271b9cdb1e9466d92
  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. weblayer/
  51. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  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. DEPS
  68. DIR_METADATA
  69. LICENSE
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md
  76. WATCHLISTS
README.md

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