Export current profiler frame to Chrome Trace Event Format

TestWindow.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using UnityEditorInternal;
using System;
using System.Text;
using System.IO;

public class TestWindow : EditorWindow 
{

    [MenuItem("Tools/Test Window")]
    public static void CreateWindow()
    {
        var wnd = EditorWindow.GetWindow<TestWindow>();
        wnd.Show();
    }

    private void OnGUI()
    {
        if (GUILayout.Button("Export Frame"))
        {
            var iter = new ProfilerFrameDataIterator();
            var threads = iter.GetThreadCount(ProfilerDriver.lastFrameIndex);
            var data = new ProfilerData();
            data.otherData.frameTime = iter.frameTimeMS;

            for (var i = 0; i < threads; i++)
            {
                iter.SetRoot(ProfilerDriver.lastFrameIndex, i);
                if (!iter.Next(true)) continue;

                do
                {
                    var item = ProfilerItem.Create(iter);
                    item.tid = i;
                    data.Add(item);
                } while (iter.Next(true));
            }

            iter.Dispose();

            var json = JsonUtility.ToJson(data);
            File.WriteAllText(Path.Combine(Application.dataPath, "../Traces/profiler.json"), json);
        }
    }

    [Serializable]
    private class ProfilerData
    {
        public List<ProfilerItem> traceEvents = new List<ProfilerItem>();
        public ProfilerOtherData otherData = new ProfilerOtherData();

        public void Add(ProfilerItem item)
        {
            traceEvents.Add(item);
        }
    }

    [Serializable]
    private class ProfilerOtherData
    {
        public float frameTime;
    }

    [Serializable]
    private class ProfilerItem
    {
        public int pid = 1;
        public int tid = 1;
        public string ph = "X";
        public int ts;
        public int dur;
        public string name;
        public ProfilerItemArgs args;

        public static ProfilerItem Create(ProfilerFrameDataIterator iter)
        {
            var item = new ProfilerItem() {name = iter.name, dur = (int)(iter.durationMS * 1000), ts = (int)(iter.startTimeMS * 1000)};
            item.args = new ProfilerItemArgs() {path = iter.path, instanceId = iter.instanceId, sampleId = iter.sampleId};
            return item;
        }
    }

    [Serializable]
    private class ProfilerItemArgs
    {
        public string path;
        public int instanceId;
        public int sampleId;
    }
}