title: webview_flutter: Uncaught (in promise) NotAllowedError: Write permission denied
body: <p>Expected behavior:
  Copy text using <code>Copy to clipboard</code> from a website</p>
  <p>Behavior:
  It throws the following error and text is not copied to android's Clipbord.</p>
  <p>Package: webview_flutter</p>
  <pre><code>I/chromium(12065): [INFO:CONSOLE(0)] &quot;Uncaught (in promise) NotAllowedError: Write permission denied.&quot;, source: ..url (0)
  </code></pre>
  <p>sample code:</p>
  <pre><code>WebView(
       javascriptMode: JavascriptMode.unrestricted,
       initialUrl: url,
    )
  </code></pre>