hschlueter 457f446114 Implement default GlTextureProcessor in SingleFrameGlTextureProcessor.
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
2022-06-09 17:41:09 +00:00
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