Load the framebuffer and vertex array object extensions.
Load the framebuffer and vertex array object extensions.

BUG=angleproject:879
BUG=angleproject:1038

Change-Id: Idd2ad36707c17d13c45bc4fc131ec1ebfc45e0a5
Reviewed-on: https://chromium-review.googlesource.com/274817
Reviewed-by: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Tested-by: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>

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