Check that ANGLE_instanced_arrays state does not leak to browser

    This test must be run manually.

    This test tests that leaving state for ANGLE_instanced_arrays with non-default values at the
    end of rendering does not interfere with proper compositing of results.
    Failures seen on Linux and Mac with Chrome 32.
    See http://crbug.com/304927 for more info.

    You should see a green rectangle
    with black a outline on success.  Briefly flashing red is normal.