Fix glGetIntegerv(GL_TEXTURE_BINDING_EXTERNAL_OES, ...) BUG=angleproject:1332 Change-Id: I591b9520bc1122eb6232803ac86b6d0322f8c349 Reviewed-on: https://chromium-review.googlesource.com/390323 Commit-Queue: John Bauman <jbauman@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>