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This change also tightens `FakeVideoRenderer` to only 'handle' buffers that are close to the current playback position. This condition controls whether the renderer fires `onVideoSizeChanged` and `onRenderedFirstFrame`, both of which should only be fired once the frame has been 'released' to the screen, which in a real renderer happens much closer to 'current position' than the existing 250ms of `FakeRenderer.SOURCE_READAHEAD_US`. A later change uses `VideoFrameMetadataListener` to test ExoPlayer behaviour in scrubbing mode. PiperOrigin-RevId: 740763283