Improvements to ui::lottie::Animation observer API.

These will be used in a subsequent CL for ChromeOS, but they seem like
generally good improvements to have:
1) Allow for multiple AnimationObservers. Not sure why there was only
   one allowed before, but most observer APIs allow for multiple.
2) Call AnimationObserver::OnAnimationCycleEnded() *after* painting the
   last frame of the cycle rather than before.  This allows an observer
   to safely change the state of the animation within the observer
   notification itself (ex: the observer may want to Stop() after a
   cycle ends).

Bug: b:223672841
Change-Id: Ie532ade096af7801cd2f24ff7a2ff612e2e3f7a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3515627
Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Commit-Queue: Eric Sum <esum@google.com>
Cr-Commit-Position: refs/heads/main@{#979986}
6 files changed
tree: 7691540f86d8460e1dbb38a11bd029d6c3b7d61d
  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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