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[Public WebGL] Minor spec updates



A couple of minor spec updates to WebGL 2.0:

 - Texture swizzling has been removed from the specification in
https://github.com/KhronosGroup/WebGL/pull/854 . On some WebGL
implementations, texture swizzles can not be implemented in a
performant manner, meaning that applications relying on this
functionality would run significantly more slowly on those
implementations. For this reason, texture swizzles will not be
supported in WebGL 2.0.

 - A query of the implementation-dependent maximum client wait timeout
has been added in https://github.com/KhronosGroup/WebGL/pull/871 .
This is intended to prevent applications from blocking the browser's
main thread for long periods of time. An INVALID_OPERATION error will
now be generated if the user requests a timeout larger than the
maximum.

Please send any comments about these changes to the list.

Thanks,

-Ken

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