[FilesA11y] Keep focus on "switch view" button after it's activated

When "switch view" button is activated by keyboard, the focus should
stay on the button to keep consistent behaviour as other action buttons.

Note: there are also other changes in the CL
* Add a public method for FilesTooltip called showTooltip(), it will
explicitly show tooltip for the current visible tooltip target.
* Handle keyup/click event together to prevent infinite triggering for
callback. "click" event will be triggered multiple times if users hold
Enter/Space key down without releasing (demo: http://shortn/_Z1x7Cq1SfF),
we need to have additional logic there to prevent it (demo:
http://shortn/_QzY2THz20b)

Demo: http://shortn/_NzAKaQfuHo

Bug: 1221202
Test: deployed to DUT and visually inspect
Test: browser_tests --gtest_filter="*FilesTooltip*"
Change-Id: Ib1ab52ee7c54f253731611934d77163dc2df235b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3459366
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Wenbo Jie <wenbojie@chromium.org>
Cr-Commit-Position: refs/heads/main@{#973389}
7 files changed
tree: 6d9646c2804082ed30a38b5fbca9d5df5a4e3d76
  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. cloud_print/
  13. codelabs/
  14. components/
  15. content/
  16. courgette/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. media/
  32. mojo/
  33. native_client_sdk/
  34. net/
  35. pdf/
  36. ppapi/
  37. printing/
  38. remoting/
  39. rlz/
  40. sandbox/
  41. services/
  42. skia/
  43. sql/
  44. storage/
  45. styleguide/
  46. testing/
  47. third_party/
  48. tools/
  49. ui/
  50. url/
  51. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython
  62. .vpython3
  63. .yapfignore
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. DEPS
  69. DIR_METADATA
  70. ENG_REVIEW_OWNERS
  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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