[Extensions c2s] Display hover card for toolbar action views

Displays a hover card when mouse hovers a toolbar action view. If the
mouse moves between toolbar actions, the hover card transitions between
them. Hides the hover card when the mouse is moved outside of the toolbar
action views and on any other event.

Toolbar action hover card controller is based on tab hover card
controller. For now we are copying functionality, with a future goal of
having a base hover card.

Toolbar action hover cards are under a feature flag.

Screencast: https://drive.google.com/file/d/1oe_g0V0BDSyT7VP5i8Zkuf2GEoMEZNQt/view?usp=sharing

Bug: 1351778
Change-Id: I7c5b24075d0845bef283a4acd99f8d588a2adc3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3828197
Reviewed-by: Dana Fried <dfried@chromium.org>
Commit-Queue: Emilia Paz <emiliapaz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1037253}
16 files changed
tree: fc81ce7dc5d62ed5770c1c299a98448a83e2396b
  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. .vpython
  61. .vpython3
  62. .yapfignore
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  69. ENG_REVIEW_OWNERS
  70. LICENSE
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md
  77. WATCHLISTS
README.md

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