Schema Change for New Event Grid Events Emitting from Service Bus (Azure#11935)

* draft for schema changes

* Revert "draft for schema changes"

This reverts commit 04faa0d.

* schema change

* modify existing swagger

Author: DorothySun216

specification/eventgrid/data-plane/Microsoft.ServiceBus/stable/2018-01-01/ServiceBus.json

@@ -66,6 +66,66 @@
           "type": "string"
         }
       }
+    },
+    "ServiceBusActiveMessagesAvailablePeriodicNotificationsEventData": {
+      "description": "Schema of the Data property of an EventGridEvent for a Microsoft.ServiceBus.ActiveMessagesAvailablePeriodicNotifications event.",
+      "type": "object",
+      "properties": {
+        "namespaceName": {
+          "description": "The namespace name of the Microsoft.ServiceBus resource.",
+          "type": "string"
+        },
+        "requestUri": {
+          "description": "The endpoint of the Microsoft.ServiceBus resource.",
+          "type": "string"
+        },
+        "entityType": {
+          "description": "The entity type of the Microsoft.ServiceBus resource. Could be one of 'queue' or 'subscriber'.",
+          "type": "string"
+        },
+        "queueName": {
+          "description": "The name of the Microsoft.ServiceBus queue. If the entity type is of type 'subscriber', then this value will be null.",
+          "type": "string"
+        },
+        "topicName": {
+          "description": "The name of the Microsoft.ServiceBus topic. If the entity type is of type 'queue', then this value will be null.",
+          "type": "string"
+        },
+        "subscriptionName": {
+          "description": "The name of the Microsoft.ServiceBus topic's subscription. If the entity type is of type 'queue', then this value will be null.",
+          "type": "string"
+        }
+      }
+    },
+    "ServiceBusDeadletterMessagesAvailablePeriodicNotificationsEventData": {
+      "description": "Schema of the Data property of an EventGridEvent for a Microsoft.ServiceBus.DeadletterMessagesAvailablePeriodicNotifications event.",
+      "type": "object",
+      "properties": {
+        "namespaceName": {
+          "description": "The namespace name of the Microsoft.ServiceBus resource.",
+          "type": "string"
+        },
+        "requestUri": {
+          "description": "The endpoint of the Microsoft.ServiceBus resource.",
+          "type": "string"
+        },
+        "entityType": {
+          "description": "The entity type of the Microsoft.ServiceBus resource. Could be one of 'queue' or 'subscriber'.",
+          "type": "string"
+        },
+        "queueName": {
+          "description": "The name of the Microsoft.ServiceBus queue. If the entity type is of type 'subscriber', then this value will be null.",
+          "type": "string"
+        },
+        "topicName": {
+          "description": "The name of the Microsoft.ServiceBus topic. If the entity type is of type 'queue', then this value will be null.",
+          "type": "string"
+        },
+        "subscriptionName": {
+          "description": "The name of the Microsoft.ServiceBus topic's subscription. If the entity type is of type 'queue', then this value will be null.",
+          "type": "string"
+        }
+      }
     }
   }
 }