Commits on Sep 11, 2024

1. Add state setters to MediaSourceAttachment (#3801) …

   In preparation for cross-thread MediaSource objects, a small amount of
   state and associated setters are being added to the
   MediaSourceAttachment interface. This will allow for a push model,
   instead of a pull model, for state such as recent media timestamps, and
   the error status of the HTMLMediaElement.
   
   Usage of these setters is gated through the
   `"MediaElement.EnableUsingMediaSourceAttachmentMethods"` H5VCC flag.
   This flag needs to be coordinated between a `HTMLMediaElement`, the
   attached `MediaSource`, and all `SourceBuffers` used. As such, the value
   of the flag when the `HTMLMediaElement` was created is used to
   coordinate the state of the rest of the related objects. This prevents a
   flag mismatch, such as if the H5VCC value is updated after the
   `HTMLMediaElement` has been created but before the `MediaSource` is
   created.
   
   This is based off of the following Chromium changes:
   
   *  https://chromium-review.googlesource.com/c/chromium/src/+/2391934
   *  https://chromium-review.googlesource.com/c/chromium/src/+/2401808
   
   b/338425449
   
   (cherry picked from commit e462633)

   

   at-ninja authored and anonymous1-me committed Sep 11, 2024
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