Redo TimelineTask API

runtime/lib/timeline.cc

Index: runtime/lib/timeline.cc
diff --git a/runtime/lib/timeline.cc b/runtime/lib/timeline.cc
index 06c3ba7c0cc6ea9cc207ecc39b2ddf40b9308fbc..a26c847cf74b6ba3f50e20eeda39851a73f256f2 100644
--- a/runtime/lib/timeline.cc
+++ b/runtime/lib/timeline.cc
@@ -126,4 +126,46 @@ DEFINE_NATIVE_ENTRY(Timeline_reportCompleteEvent, 5) {
   return Object::null();
 }
 
+
+DEFINE_NATIVE_ENTRY(Timeline_reportInstantEvent, 4) {
+  GET_NON_NULL_NATIVE_ARGUMENT(Integer, start, arguments->NativeArgAt(0));
+  GET_NON_NULL_NATIVE_ARGUMENT(String, category, arguments->NativeArgAt(1));
+  GET_NON_NULL_NATIVE_ARGUMENT(String, name, arguments->NativeArgAt(2));
+  GET_NON_NULL_NATIVE_ARGUMENT(String, args, arguments->NativeArgAt(3));
+
+  TimelineEventRecorder* recorder = Timeline::recorder();
+  if (recorder == NULL) {
+    return Object::null();
+  }
+
+  if (!isolate->GetDartStream()->Enabled()) {
+    // Dart stream is not enabled for this isolate, do nothing.
+    return Object::null();
+  }
+
+  int64_t pid = OS::ProcessId();
+  int64_t tid = OSThread::ThreadIdToIntPtr(OSThread::GetCurrentThreadTraceId());
+
+  char* json = OS::SCreate(zone,
+      "{\"name\":\"%s\",\"cat\":\"%s\",\"tid\":%" Pd64 ",\"pid\":%" Pd64 ","
+      "\"ts\":%" Pd64 ",\"ph\":\"I\",\"args\":%s}",
+      name.ToCString(),
+      category.ToCString(),
+      tid,
+      pid,
+      start.AsInt64Value(),
+      args.ToCString());
+
+  TimelineEvent* event = isolate->GetDartStream()->StartEvent();
+  if (event == NULL) {
+    // Stream was turned off.
+    return Object::null();
+  }
+  // json was allocated in the zone and a copy will be stored in event.
+  event->SerializedJSON(json);
+  event->Complete();
+
+  return Object::null();
+}
+
 }  // namespace dart