- Electron version: 0.37.6
- Operating system: Windows 10

In VSCode, in order to support screen readers while editing text, we set the contents of a `<textarea>` to the contents of the line and lines surrounding the cursor and we mirror the editor selection in the `<textarea>` via `setSelectionRange`.

Chromium is not the fastest when it comes to setting large amounts of text :) (such as > 10,000 characters) and basically stalls all the time. Apparently, Electron already has some knowledge about when a screen reader is attached to the main process window (in C++ code). Is it possible to expose this as a getter + event when it first happens in the `electron` API.

We could then maintain this costly `<textarea>` sync only when really needed.

atom/browser/api/atom_api_app.cc
content::WebContents* web_contents,
    net::SSLCertRequestInfo* cert_request_info,
    std::unique_ptr<content::ClientCertificateDelegate> delegate) {
  std::shared_ptr<content::ClientCertificateDelegate>
      shared_delegate(delegate.release());
  bool prevent_default =
      Emit("select-client-certificate",
           WebContents::CreateFrom(isolate(), web_contents),
           cert_request_info->host_and_port.ToString(),
           cert_request_info->client_certs,
           base::Bind(&OnClientCertificateSelected,
                      isolate(),
                      shared_delegate));
  
  if (!prevent_default)
    shared_delegate->ContinueWithCertificate(
        cert_request_info->client_certs[0].get());
}
void App::OnGpuProcessCrashed(base::TerminationStatus exit_code) {
  Emit("gpu-process-crashed");
}
base::FilePath App::GetPath(mate::Arguments* args, const std::string& name) {