- Electron version: v0.37.5
- Operating system: Any

It would be useful if we can open DevTools choosing all of it's available position: detached, docked right or docked bottom.

The new API could be something like this:
# webContents.openDevTools([options])

Opens the devtools.
- options Object (optional)
  - mode String - ['detached' | 'right' | 'bottom'] . opens DevTools in specified position. Defaults to last used mode.
  - detach Boolean - opens DevTools in a new window (deprecated, use mode: 'detached')

atom/browser/api/atom_api_web_contents.cc
const base::ListValue& args) {
  return Send(new AtomViewMsg_Message(routing_id(), channel, args));
}
void WebContents::SendInputEvent(v8::Isolate* isolate,
                                 v8::Local<v8::Value> input_event) {
  const auto view = web_contents()->GetRenderWidgetHostView();
  if (!view)
    return;
  const auto host = view->GetRenderWidgetHost();
  if (!host)
    return;
  int type = mate::GetWebInputEventType(isolate, input_event);
  if (blink::WebInputEvent::isMouseEventType(type)) {
    blink::WebMouseEvent mouse_event;
    if (mate::ConvertFromV8(isolate, input_event, &mouse_event)) {
      host->ForwardMouseEvent(mouse_event);
      return;
    }
  } else if (blink::WebInputEvent::isKeyboardEventType(type)) {
    content::NativeWebKeyboardEvent keyboard_event;
    if (mate::ConvertFromV8(isolate, input_event, &keyboard_event)) {
      host->ForwardKeyboardEvent(keyboard_event);
      return;
    }
  } else if (type == blink::WebInputEvent::MouseWheel) {
    blink::WebMouseWheelEvent mouse_wheel_event;
    if (mate::ConvertFromV8(isolate, input_event, &mouse_wheel_event)) {
      host->ForwardWheelEvent(mouse_wheel_event);
      return;
    }