Check for GL_EXT_geometry_shader on ES

BUG=skia:

Change-Id: If4f13af35679c048253c6c513a74e79be808dd74
Reviewed-on: https://skia-review.googlesource.com/8466
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
1 file changed