Render Pass Descriptor
constructor(colorAttachments: List<RenderPassDescriptor.ColorAttachment> = listOf(), depthStencilAttachment: RenderPassDescriptor.DepthStencilAttachment? = null, occlusionQuerySet: QuerySet? = null, timestampWrites: RenderPassTimestampWrites? = null, maxDrawCount: GPUSize64, label: String? = null)