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[Public WebGL] Implement extension EXT_frag_depth in WebGL

Its been mentioned several times before, however I'd like to request that WEBGL_frag_depth be added to the extensions.


Previous mentions:

gl_FragDepth and the focus of WebGL

Dynamic loops and gl_FragDepth access in fragment shader

As mentioned in follow up by Florian Bösch:
This is a useful capability in circumstances where raycasting, raytracing, path-tracing, paralax-mapping, signed distance fields, impostors etc. are involved and rendered together with rasterized geometry.