func RegisterProcessor(handler Handler) {
	handlers = append(handlers, handler)
}
RegisterProcessor registers a stream processor for media-types
package diff
import (
	"context"
	"io"
	"os"
	"github.com/containerd/containerd/archive/compression"
	"github.com/containerd/containerd/images"
	"github.com/gogo/protobuf/types"
	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
	"github.com/pkg/errors"
)
var (
	handlers []Handler
	ErrNoProcessor = errors.New("no processor for media-type")
)
func init() {
	RegisterProcessor(compressedHandler)
}