
This extension is needed for editing HDR input with OpenGL, as the ExternalTextureProcessor samples raw YUV values from the external texture for HDR and converts them to RGB itself rather than relying on the OpenGL driver to do this automatically as for SDR. PiperOrigin-RevId: 460424154 (cherry picked from commit 413016f7efea9dbb1194558374d9b9a8777a0d8c)