message: Allow widget iframes to request camera and microphone permissions.
diff: @@ -393,6 +393,10 @@ export default React.createClass({
  const sandboxFlags = "allow-forms allow-popups allow-popups-to-escape-sandbox "+
  "allow-same-origin allow-scripts allow-presentation";
  + // Additional iframe feature pemissions
  + // (see - https://sites.google.com/a/chromium.org/dev/Home/chromium-security/deprecating-permissions-in-cross-origin-iframes and https://wicg.github.io/feature-policy/)
  + const iframeFeatures = "microphone; camera; encrypted-media;";
  +
  if (this.props.show) {
  const loadingElement = (
  <div className='mx_AppTileBody mx_AppLoading'>
  @@ -413,6 +417,8 @@ export default React.createClass({
  <div className={this.state.loading ? 'mx_AppTileBody mx_AppLoading' : 'mx_AppTileBody'}>
  { this.state.loading && loadingElement }
  <iframe
  + is
  + allow={iframeFeatures}
  ref="appFrame"
  src={this._getSafeUrl()}
  allowFullScreen="true"
  