FrameCapture: Integer attribs in MEC If the component type of a vertex attribute is integer, we need to use the appropriate VertexAttribI* functions to set it up. Test: Asphalt 9 MEC Bug: angleproject:5883 Change-Id: I2ab2248e5a36cc6636b081acf6474b5dbe2484db Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3305057 Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Cody Northrop <cnorthrop@google.com>