Add local variable declaration token position to service protocol

runtime/vm/service/service.md

Index: runtime/vm/service/service.md
diff --git a/runtime/vm/service/service.md b/runtime/vm/service/service.md
index 7aab061e52551d661374e6b9c0c7e85c973870bf..b9947e933a00a0e3da1f03fba409a2da293b9ef7 100644
--- a/runtime/vm/service/service.md
+++ b/runtime/vm/service/service.md
@@ -895,6 +895,15 @@ _BeingInitialized_ [Sentinel](#sentinel).
 class BoundVariable {
   string name;
   @Instance|Sentinel value;
+
+  // The token position where this variable was declared.
+  int declarationTokenPos;
+
+  // The first token position where this variable is visible to the scope.
+  int visibleStartTokenPos;
+
+  // The last token position where this variable is visible to the scope.
+  int visibleEndTokenPos;
 }
 ```