Set target framerate using a Video control message

The current implementation uses SDP format parameters to adjust
the framerate. This works well for VP8 and VP9 but is not the
supported way of adjusting the AV1 framerate and isn't possible
for H.264. Also we've seen that other browsers occasionally
mangle the SDP (or even set their own max-fr values) which further
complicates this logic.

I'd like to have a consistent way to set the target framerate for
the host, one which will work regardless of the currently
selected encoder so my new approach is to use a control message.

I will likely extend this in the future to control the encoder
speed as well though that is not in scope for this CL.

Bug: 217468304
Change-Id: I690420f5af02c5ed11f96bad5a7646cf9eb2cc95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4448768
Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
Commit-Queue: Joe Downing <joedow@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1135337}
16 files changed
tree: edec405af2bb156cd2b1e5f68921a51a032363e7
  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. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  69. LICENSE
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md
  76. WATCHLISTS
README.md

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