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Use a duration event for "FlutterEngineMainEnter" so about:tracing will use it as time 0. (#2703)

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Ryan Macnak 2016-05-19 16:14:07 -07:00 committed by Yegor
parent 7fab0c350b
commit 1b936794aa
1 changed files with 11 additions and 9 deletions
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20
sky/engine/core/script/dart_init.cc
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@ -570,16 +570,18 @@ void InitDartVM() {
free(init_error);
// Send the earliest available timestamp in the application lifecycle to
// timeline. The difference between this timestamp and the time we render the
// very first frame gives us a good idea about Flutter's startup time.
// timeline. The difference between this timestamp and the time we render
// the very first frame gives us a good idea about Flutter's startup time.
// Use a duration event so about:tracing will consider this event when
// deciding the earliest event to use as time 0.
if (blink::engine_main_enter_ts != 0) {
Dart_TimelineEvent("FlutterEngineMainEnter", // label
blink::engine_main_enter_ts, // timestamp0
0, // timestamp1_or_async_id
Dart_Timeline_Event_Instant, // event type
0, // argument_count
nullptr, // argument_names
nullptr // argument_values
Dart_TimelineEvent("FlutterEngineMainEnter", // label
blink::engine_main_enter_ts, // timestamp0
blink::engine_main_enter_ts, // timestamp1_or_async_id
Dart_Timeline_Event_Duration, // event type
0, // argument_count
nullptr, // argument_names
nullptr // argument_values
);
}
}