log if/when we paused

Change-Id: Ife78dcb996cc0dde3b3303fa0b816d0893a3a7e1

ipn/ipnlocal/local.go

@@ -937,6 +937,8 @@ func (b *LocalBackend) pauseOrResumeControlClientLocked() {
 	prefs := b.pm.CurrentPrefs()
 	pauseForSyncPref := prefs.Valid() && prefs.Sync().EqualBool(false)
 
+	b.logf("pauseForNetwork = %t, pauseForSyncPref = %t", pauseForNetwork, pauseForSyncPref)
+
 	b.cc.SetPaused(pauseForNetwork || pauseForSyncPref)
 }