Display average time between collections

runtime/bin/vmservice/client/lib/src/service/object.dart

Index: runtime/bin/vmservice/client/lib/src/service/object.dart
diff --git a/runtime/bin/vmservice/client/lib/src/service/object.dart b/runtime/bin/vmservice/client/lib/src/service/object.dart
index d63afa36846e2714e1f809e749e331ae2d9a5552..93356a4bf46dbd4b48742932936a90c5e2af3954 100644
--- a/runtime/bin/vmservice/client/lib/src/service/object.dart
+++ b/runtime/bin/vmservice/client/lib/src/service/object.dart
@@ -495,6 +495,7 @@ class HeapSpace extends Observable {
   @observable int external = 0;
   @observable int collections = 0;
   @observable double totalCollectionTimeInSeconds = 0.0;
+  @observable double averageCollectionPeriodInMillis = 0.0;
 
   void update(Map heapMap) {
     used = heapMap['used'];
@@ -502,6 +503,7 @@ class HeapSpace extends Observable {
     external = heapMap['external'];
     collections = heapMap['collections'];
     totalCollectionTimeInSeconds = heapMap['time'];
+    averageCollectionPeriodInMillis = heapMap['avgCollectionPeriodMillis'];
   }
 }