hschlueter e25bf81195 Use GlTextureProcessor to avoid redundant copy in MediaPipeProcessor.
After this change GlEffects can use any GlTextureProcessor not just
SingleFrameGlTextureProcessor.
MediaPipeProcessor now implements GlTextureProcessor directly which
allows it to reuse MediaPipe's output texture for its output texture
and avoids an extra copy shader step.

PiperOrigin-RevId: 456530718
2022-06-27 11:33:30 +01:00
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