Fill some gaps in the ANGLE end2end instanced draw test. The only testing of points was on D3D11 and D3D11_FL9_3. There was little testing of number of instances and different divisors. Remove old one-off tests which are now redundant. Disable the D3D11_FL9_3 points test which was passing purely by chance. That code has bugs and only supports data from a buffer, while the test uses data in client memory. BUG=angleproject:2672 Change-Id: I5b5707a6fdd0960e81c25a2eb8ed96a1452d9868 Reviewed-on: https://chromium-review.googlesource.com/c/1450789 Commit-Queue: Frank Henigman <fjhenigman@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>