df6c8f1d8a
SingleFrameGlTextureProcessor is now an abstract class containing a default implementation of the more flexible GlTextureProcessor interface while still exposing the same simple abstract methods for single frame processing it previously did. FrameProcessorChain and GlEffect will be changed to use GlTextureProcessor in follow-ups. PiperOrigin-RevId: 453633000 (cherry picked from commit 0b37d860d13df1ac638f5a75c7af32c840e02956)