
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 (cherry picked from commit 555ab97e34d6586d38a9979bc0595a4818b7ecb8)