[Bug 98480] Support R8 image texture in ES 3.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98480

--- Comment #8 from Dongseong Hwang <dongseong.hwang at intel.com> ---
ChromeOS uses GL ES 3.1 and needs R8 and RG8 support, because
1. Chromium has its own CMAA implementation and R8 support is critical.
https://www.opengl.org/registry/specs/INTEL/framebuffer_CMAA.txt
2. Chromium uses R8 and RG8 to draw YUV video by itself.

NV_image_formats supports too many formats, although it's GLES extension. If
some formats cause lots of pain, I hope new extension which is subset of
NV_image_formats, is added.
https://www.khronos.org/registry/gles/extensions/NV/NV_image_formats.txt

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