* 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_->SetVisibleOnAllWorkspaces(visible);
}
bool BrowserWindow::IsVisibleOnAllWorkspaces() {
  return window_->IsVisibleOnAllWorkspaces();
}
void BrowserWindow::SetAutoHideCursor(bool auto_hide) {
  window_->SetAutoHideCursor(auto_hide);
}
void BrowserWindow::SelectPreviousTab() {
  window_->SelectPreviousTab();
}
void BrowserWindow::SelectNextTab() {
  window_->SelectNextTab();
}
void BrowserWindow::MergeAllWindows() {
  window_->MergeAllWindows();
}
void BrowserWindow::MoveTabToNewWindow() {
  window_->MoveTabToNewWindow();
}
void BrowserWindow::ToggleTabBar() {
  window_->ToggleTabBar();
}
void BrowserWindow::AddTabbedWindow(NativeWindow* window,
                                    mate::Arguments* args) {
  const bool windowAdded = window_->AddTabbedWindow(window);
  if (!windowAdded)
    args->ThrowError("AddTabbedWindow cannot be called by a window on itself.");
}
void BrowserWindow::SetVibrancy(mate::Arguments* args) {