[From the Profiler docs](https://reactjs.org/docs/profiler.html#onrender-callback):

> The Profiler requires an onRender function as a prop. React calls this function any time a component within the profiled tree “commits” an update.

However, given:

```jsx
import React from 'react'
import ReactDOM from 'react-dom'

function Counter() {
  const [count, setCount] = React.useState(0)
  const increment = () => setCount(c => c + 1)
  return <button onClick={increment}>{count}</button>
}

function App() {
  return (
    <div>
      <React.Profiler
        id="counter"
        onRender={() => console.log('called')}
      >
        <div>
          Profiled counter
          <Counter />
        </div>
      </React.Profiler>
      <div>
        Unprofiled counter
        <Counter />
      </div>
    </div>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))
```

I'm getting a log when I click on the unprofiled counter.

Reproduction: https://codesandbox.io/s/react-codesandbox-tnff6

Am I misunderstanding this API, or is this a bug?
if (__DEV__ && enableProfilerTimer) {
            it('should warn if required params are missing', () => {
              expect(() => {
                ReactTestRenderer.create(<React.Profiler />);
              }).toWarnDev(
                'Profiler must specify an "id" string and "onRender" function as props',
                {withoutStack: true},
              );
            });
          }
          it('should support an empty Profiler (with no children)', () => {
            
            expect(
              ReactTestRenderer.create(
                <React.Profiler id="label" onRender={jest.fn()} />,
              ).toJSON(),
            ).toMatchSnapshot();
            
            expect(
              ReactTestRenderer.create(
                <div>
                  <React.Profiler id="label" onRender={jest.fn()} />
                </div>,
              ).toJSON(),
            ).toMatchSnapshot();
          });
          it('should render children', () => {
            const FunctionComponent = ({label}) => <span>{label}</span>;
            const renderer = ReactTestRenderer.create(
              <div>