focus-mode: Implement media control for selected playlist

This CL will add the following changes. After creating the media widget
for the selected playlist, once it gained the audio focus, we can get
its media session request id. Then, we bind the media controller
observer with the request id, so that we can observe the state changes
for the specific media session.

When the playlist starts playing, the equalizer animation will start
playing. When the user press pause button through the media controls
on the shelf, when entering the focus panel again, the playlist will
shown in the pause state. When the ending moment comes, the playlist
will be selected state.

Bug: b/340867537
Test: manual
Change-Id: I45477392f96b1cf6efee09a7e08261a15cdc73fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5664405
Reviewed-by: Richard Chui <richui@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Hongyu Long <hongyulong@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1322484}
8 files changed
tree: 423a057b7eba91ed8df0a55f81c78662645cde45
  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. webkit/
  51. .clang-format
  52. .clang-tidy
  53. .clangd
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitallowed
  57. .gitattributes
  58. .gitignore
  59. .gitmodules
  60. .gn
  61. .mailmap
  62. .rustfmt.toml
  63. .vpython3
  64. .yapfignore
  65. ATL_OWNERS
  66. AUTHORS
  67. BUILD.gn
  68. CODE_OF_CONDUCT.md
  69. codereview.settings
  70. CPPLINT.cfg
  71. DEPS
  72. DIR_METADATA
  73. LICENSE
  74. LICENSE.chromium_os
  75. OWNERS
  76. PRESUBMIT.py
  77. PRESUBMIT_test.py
  78. PRESUBMIT_test_mocks.py
  79. README.md
  80. WATCHLISTS
README.md

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