Extend BGRA8 glGetInternalformativ workaround to ES drivers. Some ES drivers also generate INVALID_ENUM errors when querying this format, particuarly on linux Mesa+nouveau. BUG=angleproject:2219 Change-Id: I7b9cf9b003a0125fabdda63038b4c8941710e1db Reviewed-on: https://chromium-review.googlesource.com/754329 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>