void Browser::DockHide() {
  // Transforming application state from UIElement to Foreground is an
  // asynchronous operation, and unfortunately there is currently no way to know
  // when it is finished.
  // So if we call DockHide => DockShow => DockHide => DockShow in a very short
  // time, we would trigger a bug of macOS that, there would be multiple dock
  // icons of the app left in system.
  // To work around this, we make sure DockHide does nothing if it is called
  // immediately after DockShow. After some experiments, 1 second seems to be
  // a proper interval.
  if (!last_dock_show_.is_null() &&
      base::Time::Now() - last_dock_show_ < base::Seconds(1)) {
    return;
  }

  for (auto* const& window : WindowList::GetWindows())
    [window->GetNativeWindow().GetNativeNSWindow() setCanHide:NO];

  ProcessSerialNumber psn = {0, kCurrentProcess};
  TransformProcessType(&psn, kProcessTransformToUIElementApplication);
}

v8::Local<v8::Promise> Browser::DockShow(v8::Isolate* isolate) {
  last_dock_show_ = base::Time::Now();
  gin_helper::Promise<void> promise(isolate);
  v8::Local<v8::Promise> handle = promise.GetHandle();

  BOOL active = [[NSRunningApplication currentApplication] isActive];
  ProcessSerialNumber psn = {0, kCurrentProcess};
  if (active) {
    // Workaround buggy behavior of TransformProcessType.
    // http://stackoverflow.com/questions/7596643/
    NSArray* runningApps = [NSRunningApplication
        runningApplicationsWithBundleIdentifier:@"com.apple.dock"];
    for (NSRunningApplication* app in runningApps) {
      [app activateWithOptions:NSApplicationActivateIgnoringOtherApps];
      break;
    }
    __block gin_helper::Promise<void> p = std::move(promise);
    dispatch_time_t one_ms = dispatch_time(DISPATCH_TIME_NOW, USEC_PER_SEC);
    dispatch_after(one_ms, dispatch_get_main_queue(), ^{
      TransformProcessType(&psn, kProcessTransformToForegroundApplication);
      dispatch_time_t one_ms_2 = dispatch_time(DISPATCH_TIME_NOW, USEC_PER_SEC);
      dispatch_after(one_ms_2, dispatch_get_main_queue(), ^{
        [[NSRunningApplication currentApplication]
            activateWithOptions:NSApplicationActivateIgnoringOtherApps];
        p.Resolve();
      });
    });
  } else {
    TransformProcessType(&psn, kProcessTransformToForegroundApplication);
    promise.Resolve();
  }
  return handle;
}