* 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
web_contents()->RestoreFocus();
#if defined(OS_MACOSX)
  auto* rwhv = web_contents()->GetRenderWidgetHostView();
  if (rwhv)
    rwhv->SetActive(true);
#else
  if (!api_web_contents_->IsDevToolsOpened())
    web_contents()->Focus();
#endif
  Emit("focus");
}
void BrowserWindow::OnWindowShow() {
  Emit("show");
}
void BrowserWindow::OnWindowHide() {
  Emit("hide");
}
void BrowserWindow::OnWindowMaximize() {
  Emit("maximize");
}
void BrowserWindow::OnWindowUnmaximize() {
  Emit("unmaximize");
}
void BrowserWindow::OnWindowMinimize() {