NotificationRevamp: Add grouping expand/collapse animation.

- Add expand/collapse animation for group notification. This includes
fade in, fade out summary view and child notification, as well as
animations for the expand button when its size changes and the number
label changes its visibility.
- Make the expand button's base layer to be solid color for performance
since we add layers to its children views to do animation. This is also
better since we don't need to set background and repaint during
OnThemeChanged(). Also, remove the tray button style configuration
(highlight on focus) since this is not fit anymore.
- Move animation utils functions to a common file so that it can be used
in the expand button class.

Bug: 1233686
Change-Id: I44a6bd32eba341ea7467f1e9a7f9285bf37d2a06
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3313894
Commit-Queue: Andre Le <leandre@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/main@{#948621}
7 files changed
tree: b13456fe96bac7bf1342e74bf82d0d2ea08727d4
  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. jingle/
  32. media/
  33. mojo/
  34. native_client_sdk/
  35. net/
  36. pdf/
  37. ppapi/
  38. printing/
  39. remoting/
  40. rlz/
  41. sandbox/
  42. services/
  43. skia/
  44. sql/
  45. storage/
  46. styleguide/
  47. testing/
  48. third_party/
  49. tools/
  50. ui/
  51. url/
  52. weblayer/
  53. .clang-format
  54. .clang-tidy
  55. .eslintrc.js
  56. .git-blame-ignore-revs
  57. .gitattributes
  58. .gitignore
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython
  63. .vpython3
  64. .yapfignore
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. DEPS
  70. DIR_METADATA
  71. ENG_REVIEW_OWNERS
  72. LICENSE
  73. LICENSE.chromium_os
  74. OWNERS
  75. PRESUBMIT.py
  76. PRESUBMIT_test.py
  77. PRESUBMIT_test_mocks.py
  78. README.md
  79. WATCHLISTS
README.md

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