Simplify state in View#draw(canvas, parent, drawingTime)

Simplify DisplayList / RenderNode state management in
View#draw (the ugly one).

Now, we simply differentiate between drawing with a RenderNode, and
drawing without it. This is because we expect drawing a view while
detached, or to a SW canvas should function the same.

Change-Id: I8b519222b651c4ec8211071c0a7b9b70b0a6a5cf