ipn, wgengine: plumb NetworkMap down to magicsock

Now we can have magicsock make decisions based on tailcfg.Debug
settings sent by the server.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

wgengine/watchdog.go

@@ -11,6 +11,7 @@ import (
 	"time"
 
 	"github.com/tailscale/wireguard-go/wgcfg"
+	"tailscale.com/control/controlclient"
 	"tailscale.com/ipn/ipnstate"
 	"tailscale.com/tailcfg"
 	"tailscale.com/types/key"
@@ -97,6 +98,9 @@ func (e *watchdogEngine) LinkChange(isExpensive bool) {
 func (e *watchdogEngine) SetDERPMap(m *tailcfg.DERPMap) {
 	e.watchdog("SetDERPMap", func() { e.wrap.SetDERPMap(m) })
 }
+func (e *watchdogEngine) SetNetworkMap(nm *controlclient.NetworkMap) {
+	e.watchdog("SetNetworkMap", func() { e.wrap.SetNetworkMap(nm) })
+}
 func (e *watchdogEngine) SetDiscoPrivateKey(k key.Private) {
 	e.watchdog("SetDiscoPrivateKey", func() { e.wrap.SetDiscoPrivateKey(k) })
 }