Re: [WICG/webcomponents] Need a callback for when children changed or parser finished parsing children (#809)

We have bypassed this over the years in multiple ways.
I plea for Web Component gurus to work on real problems.

https://jsfiddle.net/WebComponents/ar7jengd/

````html
<template id="MY-ELEMENT">
  <img src="" onerror='this.getRootNode().host.parsed("img onerror")'>
  <style onload='this.getRootNode().host.parsed("style onload")'></style>
</template>

<my-element>
  <span></span>
  <b></b>
</my-element>

<script>
  customElements.define('my-element', class extends HTMLElement {
    constructor() {
      const templateById = (id) => document.getElementById(id);
     const clone = (id) => templateById(id).content.cloneNode(true);
     super().attachShadow({mode:"open"}).append(clone(this.nodeName));
    }
    connectedCallback() {
      setTimeout(() => this.parsed("timeout"))
      requestAnimationFrame(() => this.parsed("rAF"));
      console.log("connectedCallback");
    }
    parsed(ref){
     console.log("parsed() called by", ref, this.children)
    }
  });
</script>
````

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