Show tooltip with local variable value in Observatory debugger

runtime/vm/debugger.cc

Index: runtime/vm/debugger.cc
diff --git a/runtime/vm/debugger.cc b/runtime/vm/debugger.cc
index 4650eacc5be46db9676e8f9ab27ebfb038833fa2..60059ee051fe62504700da5c26a8233aee56a8a9 100644
--- a/runtime/vm/debugger.cc
+++ b/runtime/vm/debugger.cc
@@ -910,10 +910,13 @@ void ActivationFrame::PrintToJSONObject(JSONObject* jsobj,
       JSONObject jsvar(&jsvars);
       String& var_name = String::Handle();
       Instance& var_value = Instance::Handle();
-      intptr_t unused;
-      VariableAt(v, &var_name, &unused, &unused, &var_value);
+      intptr_t token_pos;
+      intptr_t end_token_pos;
+      VariableAt(v, &var_name, &token_pos, &end_token_pos, &var_value);
       jsvar.AddProperty("name", var_name.ToCString());
       jsvar.AddProperty("value", var_value, !full);
+      jsvar.AddProperty("tokenPos", token_pos);
+      jsvar.AddProperty("endTokenPos", end_token_pos);
     }
   }
 }