support custom clear colors in ManuallMSASRenderPass like RenderPass supports.
support custom clear colors in ManuallMSASRenderPass like RenderPass supports.

bhouston/three.js,Jozain/three.js,bhouston/three.js,bhouston/three.js,bhouston/three.js,Jozain/three.js,Jozain/three.js,bhouston/three.js,bhouston/three.js,Jozain/three.js,Jozain/three.js,Jozain/three.js