title: Cannot access the camera from a WebView
body: <p>I have an https website that uses the camera. It works fine in my desktop browser and in my Android's Chrome.</p>
  
  <p>In Flutter however, it is not working in WebView, nor WebViewScaffold.
  My app has camera permissions, but I don't get any prompt to use the camera when I connect to the website from my Flutter app.</p>
  
  <p>I get this error in logcat:</p>
  
  <pre><code>chromium: [ERROR:web_contents_delegate.cc(197)] WebContentsDelegate::CheckMediaAccessPermission: Not supported.
  </code></pre>
  
  <p>Why does it work in Chrom and not in my WebView ?! And how to make it run correctly in the WebView or WebViewScaffold ?</p>
  
  <p>Thank you.</p>