This CL adds utility methods to obtain sample-aligned timestamps from a
`SpeedProvider` to solve in a unified way the issues arising from
conversions between sample positions and microseconds.
The new utility methods will also help with the implementation of a
static method like `getDurationAfterProcessorApplied()` that will remove
the need for thread synchronization between the video and audio pipeline
for speed changing effects.
PiperOrigin-RevId: 692233318
7edbaa3f2c