Type confusion on the index buffer. It should be unsigned shorts. Fixes a crash on iOS. Bug: angleproject:4992 Bug: angleproject:5417 Change-Id: I18179a89dd81fff2582636496ea9684e432f4400 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2601162Reviewed-by: Kenneth Russell <kbr@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
