title: CEF3 upload file without open dialog
body: <p>I'm use CEF 3.2454.1344.g2782fb8 (Chromium 45.0.2454.101) in my project in Delphi 10.1. (I have to use a fairly old version of CEF/Chromium for backwards compatibility with WinXP). So my question is: when I click "Upload" button on any site I get a open file dialog, and have to choose a file to upload. It is possible to <strong>do not show</strong> this dialog to user, but give CEF some pre-assigned file instead? </p>
  
  <p>UPDATE: I've tried to do this via OnFileDialog, it's exactly I need: after clicking on "Upload" button I got a file shown on a web page, but Chromium instantly crashed after this. Any ideas?</p>
  
  <pre><code>procedure TMainForm.crm_asFileDialog(Sender: TObject;
    const browser: ICefBrowser; mode: TCefFileDialogMode;
    const title, defaultFilePath: ustring; acceptFilters: TStrings;
    selectedAcceptFilter: integer; const callback: ICefFileDialogCallback;
    out Result: Boolean);
  var
    file_list: tstringlist;
  begin
    file_list := tstringlist.Create;
    file_list.Add
      ('https://testsite.com/my_image.jpg');
    callback.Cont(0, file_list);
    file_list.Free;
    Result := true;
  end;
  </code></pre>
  
  <p>UPDATE 2: HTML code of a form</p>
  
  <pre><code>&lt;form method="post" enctype="multipart/form-data"&gt;
    &lt;input accept="image/*" type="file" name="file1" /&gt;
    &lt;input accept="image/*" type="file" name="file2" /&gt;
    &lt;input accept="image/*" type="file" name="file3" /&gt;
  &lt;/form&gt;
  </code></pre>