Document OpenGL ES and EGL features, formats and extensions.
Document OpenGL ES and EGL features, formats and extensions.

Change-Id: I38fb5acc5e0824035ccba55c28d12c8980c5905e
Reviewed-on: https://chromium-review.googlesource.com/275311
Reviewed-by: Zhenyao Mo <655bdf1d95ff956cd68886dd9e86ee5e987c9dbb@chromium.org>
Reviewed-by: Kenneth Russell <1ebccd90c2bc76de65b6f830f2128a91ed69fdfb@chromium.org>
Tested-by: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>

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