Enable the GL_EXT_geometry_shader extension where necessary

Bug: skia:
Change-Id: I37bfb90efed28748d6c3e53be5c9703c291b036c
Reviewed-on: https://skia-review.googlesource.com/93460
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
6 files changed