Re: [w3c/IndexedDB] Integrate with window.onerror (#49)

This issue is about having errors on requests be reported to global onerror; the "Report the exception" in the DOM algorithm mentioned above would apply if an exception is thrown in a callback.

Contrast:
```js
  store.put(v, k).onsuccess = e => {
    throw Error('hello world'); // will invoke window.onerror handler
  };
```
and:
```js
  store.add(v, k);
  store.put(v, k).onerror = e => {
    console.warn('this will appear'); // will not invoke window.onerror handler
  };
```






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