1 // Copyright 2013 The Flutter Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef FLUTTER_RUNTIME_START_UP_H_ 6 #define FLUTTER_RUNTIME_START_UP_H_ 7 8 #include <stdint.h> 9 10 namespace flutter { 11 12 // The earliest available timestamp in the application's lifecycle. The 13 // difference between this timestamp and the time we render the very first 14 // frame gives us a good idea about Flutter's startup time. 15 // 16 // This timestamp only covers Flutter's own startup. In an upside-down model 17 // it is possible that the first Flutter view is not initialized until some 18 // time later. In this case the timestamp may not cover the time spent in the 19 // user code prior to initializing Flutter. 20 extern int64_t engine_main_enter_ts; 21 22 } // namespace flutter 23 24 #endif // FLUTTER_RUNTIME_START_UP_H_ 25