michaelkatz 314413365b Implement transfer of resources API for renderer pre-warming
At the point of playing period transition pre-warming has completed and the renderers should receive necessary resources for playback. This CL adds the `Renderer.MessageType` `MSG_TRANSFER_RESOURCES` to direct a renderer to transfer relevant resources to another renderer.

PiperOrigin-RevId: 713372754
2025-01-08 12:12:48 -08:00
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