func DialInsecure(ctx context.Context, opts ...option.ClientOption) (*grpc.ClientConn, error) {
	return dial(ctx, true, opts)
}
DialInsecure returns an insecure GRPC connection for use communicating
with fake or mock Google cloud service implementations, such as emulators.
The connection is configured with the given ClientOptions.
package grpc
import (
	"errors"
	"golang.org/x/net/context"
	"google.golang.org/api/internal"
	"google.golang.org/api/option"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials"
	"google.golang.org/grpc/credentials/oauth"
)
var appengineDialerHook func(context.Context) grpc.DialOption
func Dial(ctx context.Context, opts ...option.ClientOption) (*grpc.ClientConn, error) {
	return dial(ctx, false, opts)
}