* 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
if (!window_unresponsive_closure_.IsCancelled())
    return;
  window_unresponsive_closure_.Reset(
      base::Bind(&BrowserWindow::NotifyWindowUnresponsive, GetWeakPtr()));
  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
      FROM_HERE,
      window_unresponsive_closure_.callback(),
      base::TimeDelta::FromMilliseconds(ms));
}
void BrowserWindow::NotifyWindowUnresponsive() {
  window_unresponsive_closure_.Cancel();
  if (!window_->IsClosed() && window_->IsEnabled() &&
      !IsUnresponsiveEventSuppressed()) {
    Emit("unresponsive");
  }
}
void BrowserWindow::BuildPrototype(v8::Isolate* isolate,
                                   v8::Local<v8::FunctionTemplate> prototype) {
  prototype->SetClassName(mate::StringToV8(isolate, "BrowserWindow"));
  mate::ObjectTemplateBuilder(isolate, prototype->PrototypeTemplate())
      .MakeDestroyable()
      .SetMethod("close", &BrowserWindow::Close)
      .SetMethod("focus", &BrowserWindow::Focus)
      .SetMethod("blur", &BrowserWindow::Blur)
      .SetMethod("isFocused", &BrowserWindow::IsFocused)
      .SetMethod("show", &BrowserWindow::Show)
      .SetMethod("showInactive", &BrowserWindow::ShowInactive)
      .SetMethod("hide", &BrowserWindow::Hide)
      .SetMethod("isVisible", &BrowserWindow::IsVisible)
      .SetMethod("isEnabled", &BrowserWindow::IsEnabled)