Avoid D3D11 primitive restart index using 32-bit indices D3D11 interprets an index value of 0xFFFF in a 16-bit index buffer as a primitive restart marker. This behavior can't be toggled off. http://msdn.microsoft.com/en-us/library/windows/desktop/bb205124(v=vs.85).aspx We work around it by converting to 32-bit indices. BUG=angle:708 Change-Id: Ibc92d6ba98e5f11a98d76cae14f90ca050a19964 Reviewed-on: https://chromium-review.googlesource.com/209883 Tested-by: Nicolas Capens <capn@chromium.org> Reviewed-by: Brandon Jones <bajones@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>