[inspector] Support multiple sessions per context group

test/inspector/isolate-data.h

Index: test/inspector/isolate-data.h
diff --git a/test/inspector/isolate-data.h b/test/inspector/isolate-data.h
index 79c15ebf5f21117b0cec8176f88bcfc25e34714c..f12a6501a33ca7066a743e28d0e739ece6021f36 100644
--- a/test/inspector/isolate-data.h
+++ b/test/inspector/isolate-data.h
@@ -83,6 +83,9 @@ class IsolateData : public v8_inspector::V8InspectorClient {
       v8::Local<v8::Module> referrer);
   static void MessageHandler(v8::Local<v8::Message> message,
                              v8::Local<v8::Value> exception);
+  static void PromiseRejectHandler(v8::PromiseRejectMessage data);
+  static int HandleMessage(v8::Local<v8::Message> message,
+                           v8::Local<v8::Value> exception);
   std::vector<int> GetSessionIds(int context_group_id);
 
   // V8InspectorClient implementation.