* **Electron Version** (output of `node_modules/.bin/electron --version`):
  * v4.0.5
* **Operating System** (Platform and Version):
  *  Windows 10 

### Expected Behavior
using  webContents api to print an html file oriention  set to landscape in default printer settings and page size set to A5, 

mainWindow.webContents.print({ silent: true, printBackground: false, deviceName: 'HP LaserJet 1020' })

My issue is : it is not printing as defined in the default printer settings

but it currently printing is deviceName not set

and need to send mainWindow.webContents.print() api to silently and printer name 

### To Reproduce
If you provide a URL, please list the commands required to clone/setup/run your repo e.g.
```sh
$ git clone git@github.com:shabeer-mdy/electron-quick-start.git
$ npm install
$ npm start || electron .
```
and set any printer name to  mainWindow.webContents.print({ silent: true, printBackground: false, deviceName: 'HP LaserJet 1020' })

set any installed printer name 



shell/browser/api/atom_api_web_contents.cc
const content::LoadCommittedDetails& details) {
  Emit("navigation-entry-commited", details.entry->GetURL(),
       details.is_same_document, details.did_replace_entry);
}
void WebContents::SetBackgroundThrottling(bool allowed) {
  background_throttling_ = allowed;
  auto* contents = web_contents();
  if (!contents) {
    return;
  }
  auto* render_view_host = contents->GetRenderViewHost();
  if (!render_view_host) {
    return;
  }
  auto* render_process_host = render_view_host->GetProcess();
  if (!render_process_host) {
    return;
  }
  auto* render_widget_host_impl = content::RenderWidgetHostImpl::FromID(
      render_process_host->GetID(), render_view_host->GetRoutingID());
  if (!render_widget_host_impl) {
    return;
  }
  render_widget_host_impl->disable_hidden_ = !background_throttling_;
  if (render_widget_host_impl->is_hidden()) {
    render_widget_host_impl->WasShown(base::nullopt);
  }
}
int WebContents::GetProcessID() const {