hschlueter 19e21d6fba Split out ExternalCopyFrameProcessor.
All (later customizable) GlFrameProcessors after the
ExternalCopyFrameProcessor receive their input from a normal OpenGL
texture not an external texture, so they won't need to worry about
the textureTransformMatrix.

PiperOrigin-RevId: 430165652
2022-02-22 17:03:25 +00:00
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