- 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
GoToOffset(offset);
  return false;
}
void WebContents::FindReply(content::WebContents* web_contents,
                            int request_id,
                            int number_of_matches,
                            const gfx::Rect& selection_rect,
                            int active_match_ordinal,
                            bool final_update) {
  v8::Locker locker(isolate());
  v8::HandleScope handle_scope(isolate());
  mate::Dictionary result = mate::Dictionary::CreateEmpty(isolate());
  if (number_of_matches == -1) {
    result.Set("requestId", request_id);
    result.Set("selectionArea", selection_rect);
    result.Set("finalUpdate", final_update);
    result.Set("activeMatchOrdinal", active_match_ordinal);
    Emit("found-in-page", result);
  } else if (final_update) {
    result.Set("requestId", request_id);
    result.Set("matches", number_of_matches);
    result.Set("finalUpdate", final_update);
    Emit("found-in-page", result);
  }
}
bool WebContents::CheckMediaAccessPermission(