* Electron version: 1.8.2
* Operating system: macos 10.13.3

Reproducing repo: https://github.com/ibash/electron-webkit-app-drag

Demonstrates a bug where `-webkit-app-region: drag` causes a browser view in front of it to miss click events. Oddly - it does not prevent hover events.

Steps:
1. Clone https://github.com/ibash/electron-webkit-app-drag, `yarn install`, `yarn start`
2. Click "button1"
3. Click "button2"

Expected:

Clicking button1 or button2 pops up an alert: "button clicked!"

Actual:

Only clicking button2 pops up an alert: "button clicked!"

atom/browser/api/atom_api_browser_window.cc
content::RenderFrameHost* rfh) {
  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP_WITH_PARAM(BrowserWindow, message, rfh)
    IPC_MESSAGE_HANDLER(AtomFrameHostMsg_UpdateDraggableRegions,
                        UpdateDraggableRegions)
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()
  return handled;
}
void BrowserWindow::OnCloseContents() {
  DCHECK(web_contents());
  
  v8::Locker locker(isolate());
  v8::HandleScope handle_scope(isolate());
  for (v8::Local<v8::Value> value : child_windows_.Values(isolate())) {
    mate::Handle<BrowserWindow> child;
    if (mate::ConvertFromV8(isolate(), value, &child) && !child.IsEmpty())
      child->window_->CloseImmediately();
  }
  
  
  
  
  
  window_->CloseImmediately();
  
  window_unresponsive_closure_.Cancel();
}
void BrowserWindow::OnRendererResponsive() {