* 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
ResetBrowserView();
  mate::Handle<BrowserView> browser_view;
  if (value->IsNull() || value->IsUndefined()) {
    window_->SetBrowserView(nullptr);
  } else if (mate::ConvertFromV8(isolate(), value, &browser_view)) {
    window_->SetBrowserView(browser_view->view());
    browser_view->web_contents()->SetOwnerWindow(window_.get());
    browser_view_.Reset(isolate(), value);
  }
}
void BrowserWindow::ResetBrowserView() {
  if (browser_view_.IsEmpty()) {
    return;
  }
  mate::Handle<BrowserView> browser_view;
  if (mate::ConvertFromV8(isolate(), GetBrowserView(), &browser_view)
    && !browser_view.IsEmpty()) {
    browser_view->web_contents()->SetOwnerWindow(nullptr);
  }
  browser_view_.Reset();
}
bool BrowserWindow::IsModal() const {
  return window_->is_modal();
}
v8::Local<v8::Value> BrowserWindow::GetNativeWindowHandle() {
  gfx::AcceleratedWidget handle = window_->GetAcceleratedWidget();
  return ToBuffer(
      isolate(), static_cast<void*>(&handle), sizeof(gfx::AcceleratedWidget));
}
void BrowserWindow::SetVisibleOnAllWorkspaces(bool visible) {