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### Preflight Checklist
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* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
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### Problem Description
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They is no way to choose the paper format (A4, A3, Letter, ...) when printing with `webContents.print()`.

### Proposed Solution
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Add something like the `pageSize` option which is available in [`webContents.printToPDF()`](https://electronjs.org/docs/api/web-contents#contentsprinttopdfoptions-callback).

shell/browser/api/electron_api_web_contents.cc
}
void Ws::DevToolsClosed() {
  v8::Locker locker(isolate());
  v8::HandleScope handle_scope(isolate());
  devtools_ontents_.Reset();
  Emit("devtools-closed");
}
bool Ws::OnMessageReceived(const IPC::Message& message) {
  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP(Ws, message)
    IPC_MESSAGE_HANDLER_CODE(WidgetHostMsg_SetCursor, OnCursorChange,
                             handled = false)
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()
  return handled;
}
// There are three ways of destroying a ws:
// 1. call ws.destroy();
// 2. garbage collection;
// 3. user closes the window of ws;
// 4. the embedder detaches the frame.
// For webview only #4 will happen, for BrowserWindow both #1 and #3 may
// happen. The #2 should never happen for ws, because webview is
// managed by GuestViewManager, and BrowserWindow's ws is managed
// by api::BrowserWindow.
// For #1, the destructor will do the cleanup work and we only need to make
// sure "destroyed" event is emitted. For #3, the content::Ws will
// be destroyed on close, and WsDestroyed would be called for it, so
// we need to make sure the api::Ws is also deleted.
// For #4, the Ws will be destroyed by embedder.