Add a missing gl.clear in rendering/point-size that makes this test passable.
Merge pull request #194 from jmadill-tg/fix-gl-point-size-test

Fix rendering/point-size conformance test
Add more status checking.
Merge pull request #195 from greggman/more-fixes-for-ext-draw-buffers-test

Add more status checking to ext-draw-buffers test.