Add ros master label.

backend/js/ros_scripts.js

@@ -155,3 +155,22 @@ function toggleRecording()
     }
   }
 }
+
+
+function getMasterName()
+{
+  var service = new ROSLIB.Service({
+    ros : ros,
+    name : '/rosapi/service_host',
+    serviceType : 'rosapi/ServiceHost'
+  });
+  
+  var request = new ROSLIB.ServiceRequest({
+    service: '/rosout/get_loggers'  // Only the master hosts this service.
+  });
+  
+  service.callService(request, function(result) {
+    console.log('Master Name = ' + result.host);
+    document.getElementById("MasterName").innerHTML = result.host;
+  });
+}