[inspector] use creation stack trace as parent for async call chains

src/inspector/v8-stack-trace-impl.h

Index: src/inspector/v8-stack-trace-impl.h
diff --git a/src/inspector/v8-stack-trace-impl.h b/src/inspector/v8-stack-trace-impl.h
index 302f6fbbb92dc3e7a4ac94442b869d1142b0ce4f..1fc1cdc619e91835d3f493f5df53a2591a2fbfb7 100644
--- a/src/inspector/v8-stack-trace-impl.h
+++ b/src/inspector/v8-stack-trace-impl.h
@@ -102,6 +102,12 @@ class AsyncStackTrace {
   std::weak_ptr<AsyncStackTrace> creation() const;
   bool isEmpty() const;
 
+  void setDescription(const String16& description) {
+    // TODO(kozyatinskiy): implement it without hack.
+    DCHECK(!m_description.length() || m_description == description);
+    m_description = description;
+  }
+
  private:
   AsyncStackTrace(int contextGroupId, const String16& description,
                   std::vector<std::shared_ptr<StackFrame>> frames,