ContentPreAllocator
class ContentPreAllocator( treeId: Int, componentContext: ComponentContext, mountContentHandler: RunnableHandler, avoidRedundantPreAllocations: Boolean, logger: ComponentsLogger?, nodeSupplier: () -> List<RenderTreeNode>, preAllocator: (Context, ContentAllocator<*>, PoolScope) -> Boolean)
Pre-allocate the mount content of all MountSpec in the given ComponentTree.
Note that this pre-allocation must be executed only after layout has been created.