Those parameters aren't optional in the current spec.
The test element-array-buffer-delete-recreate.html now fails because we don't
actually implement gl.getParameter(gl.CURRENT_PROGRAM).
Set the expected result of the test `tex-input-validation.html` to CRASH, since
that is caused by unrelated problems. The test was previously not executing
completely, because it stopped when it didn't find the implementation of
getTexParameter.
