Remove use of stringstream in the FrameTimingsRecorder constructor (#32840)
Remove use of stringstream in the FrameTimingsRecorder constructor (#32840)


flutter/engine,chinmaygarde/flutter_engine,chinmaygarde/flutter_engine,chinmaygarde/flutter_engine,devoncarew/engine,rmacnak-google/engine,flutter/engine,devoncarew/engine,devoncarew/engine,rmacnak-google/engine,rmacnak-google/engine,chinmaygarde/flutter_engine,flutter/engine,flutter/engine,flutter/engine,rmacnak-google/engine,devoncarew/engine,chinmaygarde/flutter_engine,flutter/engine,devoncarew/engine,rmacnak-google/engine,rmacnak-google/engine,devoncarew/engine,chinmaygarde/flutter_engine,devoncarew/engine,chinmaygarde/flutter_engine,flutter/engine,rmacnak-google/engine,flutter/engine