Added interfaces of WebGL extensions in recommended specification status#301

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kyasbal:add-webgl-extension-interfaces

Nov 14, 2017

Commits on Sep 27, 2017

Added WebGL extensions
kyasbal
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Commits on Nov 12, 2017

Commits on Nov 14, 2017

Fix for review https://github.com/Microsoft/TSJS-lib-generator/pull/301#discussion_r143547943
kyasbal
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