hschlueter 555ab97e34 Support chaining async GlTextureProcessors in FrameProcessorChain.
After this change, FrameProcessorChain chains any GlTextureProcessors
instead of only SingleFrameGlTextureProcessors.

The GlTextureProcessors are chained in a bidirectional manner using
ChainingGlTextureProcessorListener to feed input and output related
events forward and release events backwards.

PiperOrigin-RevId: 456478414
2022-06-27 10:36:51 +01:00
..