* 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
return window_->IsMaximizable();
}
void BrowserWindow::SetFullScreenable(bool fullscreenable) {
  window_->SetFullScreenable(fullscreenable);
}
bool BrowserWindow::IsFullScreenable() {
  return window_->IsFullScreenable();
}
void BrowserWindow::SetClosable(bool closable) {
  window_->SetClosable(closable);
}
bool BrowserWindow::IsClosable() {
  return window_->IsClosable();
}
void BrowserWindow::SetAlwaysOnTop(bool top, mate::Arguments* args) {
  std::string level = "floating";
  int relativeLevel = 0;
  std::string error;
  args->GetNext(&level);
  args->GetNext(&relativeLevel);
  window_->SetAlwaysOnTop(top, level, relativeLevel, &error);
  if (!error.empty()) {
    args->ThrowError(error);
  }
}
bool BrowserWindow::IsAlwaysOnTop() {
  return window_->IsAlwaysOnTop();
}
void BrowserWindow::Center() {